Oddly, I had one go in my favor earlier today- it said $2.50 but seemed a bit longish for that and posted at $4.00. My guess is that it sometimes DQs you right off the bat and instead of sending you back to the 'do you want to try again?' or the 'no more surveys' message, it instantly redirects to a different survey in the pool that may or may not match he value of the first screen. I also get some surveys where the topic on the first screen (automobile, personal finance, etc.) doesn't necessarily match the topic I get in the survey, even though they try to keep the topics pretty generic.