Thus, the candle problem, when placed in the real world, would have three groups: a control group which is paid 'decently and fairly', and a group that is paid 'decently and fairly' and is given financial incentives beyond that, and a group that is payed 'decently and fairly' and is given autonomy as an incentive.
That's fine, but you still need a control group that is given no compensation at all as a baseline.