With the balloon fetish it depends on who you are marketing to. There are the guys who are into nonpop who like you to use them to get off (humping them). There are lots of different pop people who want you to sit on them, stomp them, etc until they pop. Mostly it's the "slight fear and giggles" thing they are looking for, but sometimes they like the tough-guy look, like you are stomping something less than you. There are also the blow2pop guys who want you to blow up the balloons until they pop in your face. Then there is the clown fetishes, water balloon fetishes, and the people who just want you to pose with them and look pretty. It all depends on the person.
Just like ANY fetish, I suggest you don't do it unless you are really into it. It's no fun to do something that isn't really fun for you, or getting you off. (Unless it's by special request, and that makes you happy!) But tha'ts just my personal opinion.
