Because curtailment is about the available pickups not being able to take the energy. If you had a sink for it, you wouldn't be paid for curtailment so long as it was send through the grid. I bet if you used an alternate local grid the grorious (sic) (in)efficiency of capitalism will figure out how to be paid double.
Then reduce prices in that area, and there will be demand and you'll make more money.
Except you can't because there's a law saying the price of electricity has to be the same everywhere in the country. You can be right next to a wind turbine that's turned off, and they're not allowed to sell to you for less than the price they'd sell to the other end of the country, even though they're also not allowed to sell to the other end of the country.
Of course, this law was probably a reaction to a previous time where the price differences were excessively huge. A law like this doesn't exist for no reason. There is a balancing act, as both extremes were already found to have problems. It can be that the "stupid can't sell law" is actually considered good because it makes investors build new supply at the other end of the country or to build more transmission lines, instead of building where you are and trying to sell to you locally.
