I very rarely get a survey that pays out. The Peanut Labs ones are good because at least you get 5 credits for a few clicks.
I've never figured out what the ones that ask what your work involves are looking for. I've tried being everything and always get disqualified straight away.
I've had the odd one that I've spent 15 or so minutes on, am 99% finished and then they say I don't qualify. That is really annoying but it hasn't happened for a long time.