Yes and no. If you fear snails, then yea, its possible, but personally I don't think they are really a big deal.
If your LFS
is full of disease-ridden tanks, then yeah, its possible, but any half decent one wouldn't let disease run rampant killing all of their stock constantly.
You could leave the plants in the pots, but it'd be similar to leaving houseplants in their original pots. If you do, I suggest at least aerating the soil they are in a little bit and maybe adding a little fertilizer to the pot.