The valuation would go up if the investments they make generate money which would be paid at a greater rate per coin than if they did not burn any coins.
Yeah, but just remember whatever they pay for the buy wall means less money to use for investments. So it's probably no real net gain there. There would be a greater rate per coin, but less being invested to begin with, so less profit in the pools.
If it gets bad enough, then a buy wall can be used as sort of a last resort. I'd like them to try to stabilize the price using other means first though.