What good are the preview JPEGs? (newbie question)

Dear Folks,
I'm new to converting raws to DNGs, and I can't seem to find any use for the preview JPEGs that DNG converter can embed in the file.
Mac OSX (10.4.11) doesn't display them in Finder windows (Icon view mode). Get Info windows can show me a small preview whether or not I embed a JPEG. Mac OSX's Preview program can't display DNG files whether or not JPEGs are embedded in them. I don't see any difference in the functionality of Bridge and Photoshop whether they're there or not.
That pretty well describes my entire photo workflow, so if previews really are irrelevant to it, seems to me I might as well leave them out and save a little processing time and disk space.
Am I missing something obvious? (probably)
Thanks!
Ctein

Dear David (and Ramon),
Nope, no such implication whatsoever. I entirely understand the theoretical benefit. I've just been trying to find out if they'll benefit me.
BUT... here's an unexpected curiosity. I just ported one of my freshly-baked DNG file to a friend's brand new Mac, so it's running the latest versions of everything and it ought to be pretty much a stock configuration.
It can't read my DNG preview JPEG, either! When I drag the DNG file into the Preview app, it shows me a question mark, not a preview! I just double-checked, and I am generating the DNGs using the default settings in Adobe DNG Converter (medium JPEG, lossless compression, non-linear, no embedded RAW, etc.)
So, what's going on?! Ramon confirms that DNG previews should be viewable under Mac OSX. Either I'm doing something wrong (entirely likely) or there's something broken in A-DNG-C.
The DNG files I'm generating look perfectly fine in Adobe Bridge/ACR/Photoshop, by the way. It's something hinky with the JPEGs.
Anybody got a clue? I'm fresh out!
pax / puzzled Ctein

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What good are the preview JPEGs? (newbie question)

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