Selling cards to an online site

[Upinthe]

Hey everyone, I'm thinking of selling cards to an online site like Starcity or others (am I allowed to mention their names?) to get some quick cash. They're mostly foil cards that are hard to move. Has anyone done this before? I recall reading on the old board (The one before there were basic users as a member group) that someone had a bad experience doing this but my recollection is foggy.

I'm extremely wary of sites that only buy cards in NM and Played conditions. Am I right in thinking that they would probably wait until you shipped the cards and then claim they weren't in the condition described to cheat you out of money?

Thanks.