If the prices aren't riduculous, people will buy them here. I have a F8 puffer and I purposely try and breed ramshorn snails in all of my tanks for her.
if they are that much of a problem follow all advice above and during water changes remove any that you see. gravel vacs and not overfeeding is really what'll keep you from having to constantly remove them. they feed on extras and when they're full they mate.
if i were to sell them on here, how do i do it? how do i package them and all? i do have a small tank i can put them in and let them hatch and all that.
You could buy a fish to eat the snails; if you have the extra space and a possibly not so handsome newcomer doesn't bother you. Depending on what kind of snail they are a red tailed shark might eat them, but I have a six to seven inch red tailed shark and he isn't a snail eater. I had him in a thirty-five gallon, when he was just a baby and it was loaded with snails. I couldn't get him to touch them, for the life of me. But if they are common snails, a yoyo botia will eat them like crazy. Two in a seventy-five gallon fishtank will give you no worries about common snails again. But beware yoyo botias will not eat Malaysian snails.
if you buy a fish to feed on your snails...and then your snails are all gone you then have the problem of finding snails to feed to your fish....so basically after you eradicate your snails you need to put snails into your tank...:scratchhead:
so....there are many methods of baiting your snails and removing them from your tank. read the sticky about shipping fish/snails on the top of the classifieds page' for shipping info.