You want to dump it ?
Does it matter to you if they do? That's their loss if they are mining just to unload right away instead of mining a pile of it to sit on till its worth a fortune.
Besides, a lot of people want to at least pay off their mining costs and then keep any extra. Running this without an exchange means a lot of people simply won't mine it because there is no guarantee of breakeven for them.
Not only that, but you'll find a lot of people who want to invest btc into this directly and skip the mining process. Getting on an exchange would be good for it.
My votes to have it listed on Bleutrade and C-Cex. Poloniex has gotten themselves in trouble over eth and dao lately, while Bittrex has an annoying minimum order size and the new UI is bleh.