I think the insights on the multipool's effects on the market are a bit flawed. As far as the miners go, they're getting a constant stream of BC that they will in turn sell back into the market. Sure, the pool is buying to supply the miners, but the net could easily be no market movement at all assuming the miners dump their coins back (they almost always do).
But it is an interesting experiment.
Why would you mine at the BC multipool if you are just going to dump right back for BTC? You would just stay on the regular multipools that pay in BTC. I would reckon most that mine at the BC multipool will be long or medium term BC hodlers.