Truth, it can be a bit annoying when you get into a bidding war over something, and it's so hard to judge in the heat of the moment whether you'll regret overpaying for a win more than you'll regret letting it go when you could have had it for just a few bucks more.

OTOH, it's pretty much where you go to find Things You Never Knew Existed, Things No Longer Being Made, and Things Hard to Find in the US. It's like a vast online garage/estate sale that includes foreign countries.