Mac Mini 2009 SL 6.0.1 won't sleep with Wake on Demand turned on...

I'm having an issue where my Mac Mini 2009 won't go to sleep at all when I have Wake on Demand turned on. I have been manually making it go to sleep and then loath and behold its back on a few minutes later. I know it's supposed to turn on once every two hours or so, but my Mini appears to not be sleeping at all after it turns back on. I thought this feature was supposed to save me electricity and money, not the opposite. I also have the Mac to go to asleep after 5 minutes. It's not doing that either. I haven't checked the logs to see what's going on. Any ideas?

Nope. I did change a few settings and the mac now manages to sleep. However, it wakes a few minutes later and then eventually goes back to sleep. This process cycles.
I found some good info on this site...
http://reviews.cnet.com/8301-13727_7-10330473-263.html?tag=mncol
I basically just went into the terminal and with root privileges did a "pmset -a ttyskeepawake 0" which turns off the possibility of a remote login event.
Because my initial error message also was saying something about my airport I assumed it might be worth turning on AirPort on the Mini and forcing it not to make any connections to my AirPort Extreme station. At this point, I have turned off AirPort to see what it does with just the ttyskeepawake option turned off.
I might try a PMU reset to see if that has any effect.
Another thing that comes to mind is I have the Mac Mini hooked up to a Denon AV Receiver and then to an HDTV via a mini DisplayPort to HDMI adapter. Perhaps, the Denon is waking it up?

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