Listia is more like doing a three way trade than "selling" your cards. You have to find someone to give you credits in exchange for what you have and then you can use those credits to get things that you want. The credits cannot be converted back into money so you are locked into what is available to use them. That being said i have "sold" some cards on there and "bought" some cards on there, mostly things that i have not been able to trade for on here, but TCDB is my first stop every day when looking for trades.
Baseball: 1957 + 61 Topps, 1950 + 53 Bowman (Color), If i win the lottery maybe i will try to finish an 1887 Buchner Gold Coin and the 1914 and 1915 Cracker Jack Sets too