I too have been hooked by this rip-off, answering questions for 15 minutes before being told I don't qualify to answer questions. WGT wants to be a quality site, they need to contact these companies and let them know that if WGT members answer questions, they get credits, period. No more 'pre-survey' so they can get free data.
WGT, they are screwing YOUR customers on YOUR site. Do something about it.
By my calculations, I am currently owed 900 credits, as I spent 15 minutes answering questions on the 450c survey, and 10 minutes each on 3 150c surveys. I'd like a response from WGT when I can expect to get my credits? And if I am not going to get them, then I'd like a response as to what steps WGT is taking to have companies that scam and rip off their customers removed from the site.