I truly can understand the frustration.
I'm a member of several sites that do surveys and I personally prefer doing surveys here at Fusion Cash over most of the others. Seven out of ten times here at FC even if I don't qualify for the original survey I click on, I can be re-directed to another one and will get paid something for my time. It won't be as much as the original survey, and sometimes substantially less but at least it's something. And right now, that means the world to me. I've had the moments where I need to get up and leave the PC as well because it's been so frustrating the way some of the surveys go down.
I've gone through the "take the whole survey, get right to the end then be disqualified" thing. I spent a good 45 minutes to an hour on a survey at another site a little while back. Took the entire thing and got to the demographic info at the end and I was disqualified after telling them my gender. They knew from the start what my gender was, but, apparently, the requirements changed after the questions were answered. I had the same site refuse to pay me for a 300pt (which worked into about $3.50) survey that didn't credit to me immediately like it should have. I had screen shots showing that I did complete with the survey number, date and time on them. I sent them in and the site told me I had to wait 6 weeks before I could file a complaint. I waited 6 weeks and then they told me that too much time had passed and there was no record that I'd ever taken the survey at all. I stopped using that site after that.
Some survey sites are truly amazing and I've managed to get some great rewards from them, including actually getting products sent to me to try and report back on. Surveys are the best and quickest way to get the tally up that I've found so far but also the hardest. I enjoy taking surveys but I don't enjoy taking an hour long survey and not getting credited for it because of "glitches" or shady-seeming disqualifications. So, I tend to be rather picky where I do my surveys these days.