Customer calls... I need a guitar - a Podunk model ZZ-250. (I'm not naming the actual brand). Yeah, I've got one. List price is $900. I'm selling 'em for $650. Want to have a look? He says well, you see, I can find one for $500. Can you match that price? Dude, I can find a wife on the internet for $500. Can you match that price? Click. Sigh...

Suppose it's worth mentioning that I'll even let you play my guitar to see if it's what you really want...