Record Fairs - C or D?

I've been to a lot of record fairs, even worked some - but I'm about to go to one of my first that's NOT taking place in a 'cosmopolitan' city. It's here in Knoxville an admission is FREE. I buy old free jazz, old psych, old folk. Should I bother going?

Larger thread: are these ever as fun as they seem? I often feel so clausterphobic and uncomfortable i usually just get overwhlemed and don't buy anything (or, worse, make snap decisions and buy frivolous things I don't want at all). I think we can all agree that 'lists' are useless. How do you navigate? What are your personal rules? Good / bad experiences? What are record fairs like outside of Philadelphia, New York, Boston, SF, etc?