Yes ....you just never know. They could be coming down with an RI that even the breeder did not catch. They could have a number of other illnesses that were not detected. You just never know. I would and I am sure you would as well be devastated if something happened one of the snakes.
There is an AMAZING how to sheet on Quarantine on here.
I also might add that when you go to a reptile show it is also good to come home, take a shower and change clothes. I know it sounds paranoid....but you never know what you could bring home and not even know it.