this is under the assumption that the people on the non switching pools aren't mining to dump. Hashrate doesn't equal support.
This is not the assumption at all, what i'm saying is that those on the multipool, are not holding, since they dump to BTC and pay out in BTC, im sure some do not, maybe I am wrong. But what it comes down to is that the people not on multipool CAN hold, whereas those on it are definitely not.
Like I said I could be wrong and maybe I have missed some homework on multipools.
hashco.ws lets you hold the coins you want, and sell the ones you don't.
multipool.us let you hold the coins you want, and sell the ones you don't.
saying switching pools are across-the-board bad, or that most-or-all switching-pool miners 'dump' coins is a generalization; like saying all filesharing is illegal.