I signed up for this because of a Facebook ad. When I signed up, they gave me 1000 credits for free. I quickly found out that you can't get anything good for only 1,000 credits. So, I had the option of buying more, completing surveys, or listing stuff and "selling" it.
I completed over 30 surveys, but I did not get the promised 2,000 or more credits per survey. Most of the time I just got 100 credits. Sometimes, I did not get any. I had about 2800 credits, but even that wasn't enough to get anything good. So, I listed some stuff. I decided to list good stuff I wasn't using in hopes of getting a lot of credits. My auctions ended and I "sold: the items for almost 100,000 credits. But, the credits never showed up in my account. I waited for days, but nothing. The buyers all were throwing fits because Listia had taken their credits to pay. But, since Listia did not deliver the credits to me, I was not going to ship the items. After contacting Listia, I was told that sellers have to ship the items without getting paid. Supposedly, after sending the item, if the buyer gets it, then you get the credits. Well, I sent one item to test that... guess what, the "buyer" got the item, but then filed for a refund because they did not like it. Listia gave them back the credits and I never got the item back.
This is a SCAM. Then, they wouldn't close my account when I asked.