A 'routinized job' if you will.
A - Workers have no incentive not to screw the employer.
B - Employing/Retaining staff's not an issue. This is also part of the seasonal work. It's not worth looking for a different job when it's only a couple of weeks.
If this were a more perfect market (infinite time, perfectly informed participants ...), the decreasing marginal rates (to avoid being over generous), would disappear. You'd be better off pinching your neighbour's picker that picks twice 2x fruit with 2 X minimum wage then keeping you 0.9x picker at 1 X minimum wage.
But hopefully, some rules & guidelines might emerge from this type of experimentation. These would (if they are good rules & guidelines) be applicable more widely.
It'd be difficult to work out the laws of mechanics by examining an engine. But playing with a lead ball in a lab can eventually help you build a better engine.