Personally I'm at my max at the moment. But thats because I don't have the space to put them anywhere else not because I think I have to many. I can think of at least 4 more snakes I'd like to add to my collection 2 beardies, and 1 spider (maybee) But can't in till I get more room.
Like said before as long as you can provide for them and enjoy doing it you don't have to many. :3