Audio advisor question

Trying to buy a macintosh m c seventy one fifty from audio advice in palm beach , florida. My question is , why do I have to provide a payment card just to talk to them? This website seems to thank that only buyers should be serious about buying something.My feeling is that the sellers should strive to sell their product.\nHow dare audiogon demand that I give my payment option to somebody.I don't even know. You're saying that we should do this to be serious about buying. People who purchase thousands of dollars worth of merchandise are generally serious and I don't think I should have to give my personal information to them until I am ready to buy. It's none of your business. Audiogon claims that they are not responsible and they are merely a connection for buyers and sellers and are no way responsible for any deals made. Well , then you should make it so I can contact these people without your demand.