1 month ago
The issue is that many of them are looking for specific types of people. And apparently, whichever country you're located in has some effect as well, though I'm not sure. I have received rewards for the surveys I have completed, so it does work.
My opinion of the surveys? Yes, they do work, but you have to be prepared to spend your time to search through them for the ones you fit to and possibly to wait for the fitting ones as well. Also, I recommend having runa Tiwaz, as the surveys you qualify for will probably have mostly small to mediocre rewards. In short, surveys are a useful method to earn soul gems, but it will take a long time.