A high rise in price like what is happening now won't be good for the coin. Its going to pop very soon.
Go ahead and dump while you can then, afterall you can easily mine some more, right?
-MarkM-
Exactly, the only way to get XPM right now is to buy it. Unless you have a multiple computers you won't mine any. So if either gpu or a pool gets added for XPM people can and will mine it for themselves.
Right now the price is high because there is a high demand for it and everyone wants a piece. When they are able to mine it people will start undercutting each other and fear that the coin will pop and drop a lot.
I know its a bit of a weird comparison but the price for YAC coin went down dramatically when they released the gpu miner for it. I myself have quite a large share in XPM and not selling anytime soon because I think the coin has a lot more potential price wise then it is now.