MINI Barebones for only $99, is it worth it?

That won't do any gaming. It's a very outdated system with a tiny power supply, you won't be able to put any graphics card in there that's any good.
 
for 300-500 you can make a pretty decent gaming system building

Well depends on your definition of decent.

However, with that socket 478 system, you'd get a pretty week processor, and that powersupply won't be able to handle many graphics cards.
 
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