Rajkumar Hirani has an endearing personality and a lot of people look up to him for advice. He is a very well-known face among the audience. And show organizers want to encash in on his popularity. The director also has a good sense of humour and this is a plus point for any reality show judge.
Also, the show organizers feel that it would be a great chance for participants to showcase their talent in front of Rajkumar Hirani. Moreover, the feedback that would come from a person like him would be much more valuable, given his judgment on creative content.While the director is considering the offers, he will only accept something that suits him.