Well, of course the 4 kegs wouldn't come with a real deal kegerator, so it's still less than $500. But I'm not one to talk - I have so much invested in my keezer at this point!!
EDIT: Also, does the real kegerator come with the fittings you'd need for homebrew? Or is it for commercial sanke kegs? If sanke, then you'll need to buy fittings anyway.