[stinkbeetle]

That does not follow. Many things have diminishing returns curves.

[butlike]

Yes, but a curve trends to zero. A cap is a step function to zero. I think they're saying there's no point in removing those diminishing return gains if there's still positive value to be had.

[stinkbeetle]

The cap would be around the point where marginal cost exceeds benefit.

[butlike]

How do you measure that? Benefit seems like an intrinsic value to me