<i>&quot;is it easier to convince the university&#x2F;funder to do a study that could potentially connect with 6,000 students at just $5 a piece, versus a study that, at most, could reach 600 students at $50 a piece?&quot;</i><p>My guess would be that people would be more inclined to ask whether it couldn&#x27;t be 600 students at $25 a piece for the same effect, than they would whether it couldn&#x27;t be 6000 students for $2.50 a piece. Certainly, in the limit there will be some truth in that. You don&#x27;t need to offer a single student $30.000 for 15 minutes of work to be virtually assured that (s)he will bite; $10,000 will do just as well.