Yes, they will sell. You could try craigslist, too for max profit. Pet shops might not give you anything at all or very little, whereas you could theoretically sell them $2 each as pets or in lots as puffer feeders.
Good point on the loaches. They are known for their love of snails.
Thats a good idea... how long after they hatch will they survive a transfer? ... and I dont want to tell people they are feeders..I know thats silly but I like to think fish are nice... haha (i know silly) but i pretend.. haha No agro fish in my tank!