Imo the problem is they have made themselves 'famous'. So usually, an actor, actress, even a ruddy reality star will at some point have to have been 'auditioned'. In the case of these instahuns, MOD and FOD a prime example, they have just launched themselves on us, no mediator to judge if it'll work, if that makes sense.
So what you end up with in the case of mod and fod, is a couple of not very bright arses and more to the point, they have zero likeability factor. I don't know how they have been awarded some of the contracts..they aren't savvy or clever with it at all, i.e when they beg for freebies. Most people can see right through 'em and out the other side