I have run into this and I feel the same way. Just something about it that rubs me the wrong way. Don't know why, but it just seems "shady".
Contact for Price
I don’t know about the rest of you but I use Audiogon for speed and convenience. So when a seller can’t be bothered to list the price of an advertised item but says “Contact for Price”, I can’t be bothered to spend the time calling him on the phone for his sales pitch.