I remember during PMC where we talked about looking for a pool that would allow you to indirectly mine PMC by mining other currencies, selling them, then buying up PMC. Are there still any POS mining pools around? They used to be quite popular.
The problem is if you don't have enough hashrate, the payouts will be quite low and so it does make sense economically to mine that Pool.
There was a new upcoming multipool that offered to support PMP as a payout option. I'll look into that.