Running Mac Pro constantly - good or bad?

Since I stream all my content to my apple tv, my Mac Pro runs all the time. In fact, I only restart it once every other month or so. Since it is always streaming, it never sleeps either (nor do I let it).
Everything appears to be running normal, but I just want to make sure this is OK. It was quite an investment, and I need to know if I am decreasing the life of my Mac (or wearing anything out).
Thanks.

Most frequent answer to "run or sleep" overnight is: Set the monitor to sleep, let the system and hard drive run.
But that answer is getting old because I don't think that, after 10.3, we need to leave the system run to run the chron scripts.
Also consider: sleep versus shut down is choice of energy consumption (i.e., electric bills).
I think you will find that there is little information about the effect of running a given Mac (or any computer we will likely own) constantly (for "x years") because- such computers are "by design" going to lose their usefulness before they "break down from over-use."
Possibly a helpful example will clarify what I'm trying to say:
In 1999, I bought an Apple LC II - made in 1993. I kept it running for a couple years - until the hard drive failed. It would have been simple to replace the hard drive and I could have kept it running even longer. But - that Mac was using OS 7.5.5! - So it was waay out of date and usefulness. Easier and more effective to just buy a new iMac (at the time).
I got my eMac in Aug. 2003: it still runs, it is "adequate" for routine use and will probably remain so for a bit longer. Right now, it is in sleep mode in the next room. I have used that eMac at least 6 hours a day since I got it. (And it's been in screen-only sleep mode most of the rest of the time.) But when I want to "keep up" with Apple technology (and my own needs) - I have to buy a newer Mac with (in this case Intel) newer processor and newer version of operating system and newer versions of critical apps.
"I wonder what the recommended procedure is for running a Mac Pro (or any Mac for that matter). Shutdown at night? Sleep at night?" --
You may find a consensus or "average" answer to that question. I don't believe you will find the "definitive" answer because the Mac Pro is designed to satisfy a variety of personal and business needs. Ultimately: you should establish your own needs and set at least a rough "schedule" during which the Mac Pro is either in sleep mode or running.
Sorry if I seem "vague" - but the above is per my experience. It's all probabilities in the end: probably, you will not have a problem caused by keeping the Mac Pro running "indefinitely." Be consoled the Mac Pro isn't limited to the "unitized" or all-in-one construction scheme; you can replace most vital parts in a Mac Pro yourself.
Personally, I think if I continue keeping, maintaining and using my Mac Pro as I have my previous Macs, I will have this Mac Pro for even longer (4 or more years) than I had the earlier ones.
Also - the "standard rule" for any Mac or PC is to keep backups of your data and to keep a bootable 2nd drive installed in case of emergencies. But you probably have heard that advice a dozen times already.
Regards,
macnoel

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    Sep 19 13:09:54 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:14:54 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:15:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:20:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:29:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:30:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:39:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:40:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:45:34 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:54:54 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 13:55:34 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:04:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:05:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:10:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:19:54 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:20:34 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:29:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:34:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:35:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:44:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:45:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:50:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 14:59:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:00:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:09:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:10:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:15:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:24:54 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:25:34 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:34:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:35:35 localhost kernel[0] <Debug>: Wake reason: ? (Network)
    Sep 19 15:44:55 localhost kernel[0] <Debug>: Wake reason: ? (Network)
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    Please read this whole message before doing anything.
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