So far, my biggest Complaint about Listia is that they claim you can "earn points" for completing surveys. This turns out to be a total scam! Every time I've done one of the surveys, I'll spend several minutes answering questions, and then a page comes up saying I didn't "qualify" for the survey. Seriously? Dude, I just filled out 5 pages of questions, I already Took the survey! Apparently they want you to believe it was a pre-survey. This way they get lots of useful data from you, without giving you any points. I'd understand if you had to answer 3 or 4 pre-screening questions to see if you qualify for the survey. But I answered Way to many questions for this to be legitimately considered pre-screening.
I'd suspect that nobody, or almost nobody, gets points from these surveys. Needless to say, I'm not going to bother taking any surveys anymore. But I'm sure that other people will fall for this a few times before they realize it's a scam. And that's how these survey companies keep the scam going! Some of them might end up being legit, but I don't want to waste my time on pointless (literally!) surveys.
Listia makes it look like your being redirected to an independent site when you take these surveys. But I wouldn't be surprised if it turned out that Listia actually runs these "external" sites. Either way, these survey Scams make Listia appear pretty scammy themselves.