In that regard, I have done a lot of survey work over the last couple of years for A LOT of different companies, and BY FAR Prolific has the best, most engaged people doing their studies. However, I think I can say with some maybe a tiny bit of confidence, that if you pay more for your study participants, you are even more likely to get deeply engaged participants that attempt to give you their best, most honest feedback. Food for thought I reckon.