[ghaff]

It probably depends on what their intrinsic motivation related to the job is. Do they find it fun, mentally challenging (in a good way), etc,? If they're motivated in that way, the extrinsic motivation of above-market pay is probably a good thing. But if that's their only motivation and they'd rather be anywhere else if it weren't for the money, that's a negative.

[sokoloff]

100% agreed. My hypothesis (previously unstated) is that some slice of people who start out in the first bucket inevitably turn into the second bucket. (They get bored of "doing the same old thing" or they "just want a change".)