Could also mean that those surge accepters will find faster rides. Since they're not marked cars, you (as someone who may not accept surges) will never know that an Uber driver is passing you by for a juicier passenger.
That's how it already works; a nice aspect of surge pricing is that if you are willing to pay, you don't have to wait longer than you otherwise would.
I view the GP as suggesting that Uber has an incentive to show some people a larger surge price than what the market would suggest since those people will pay it anyway. (And people don't have enough information to know if Uber is charging them more because they can get away with it or if that is the price that anyone who wants a ride would pay.)
