The main thing i would want is a good arena, and people. I would have no problem paying $20 for a day of playing if there were a lot of people there and you ran good games. There would have to be somethigng unique that your arena would bring. No offence to CQBAZ, but i got bored after an hour of playing, it just seemed to small and repetative.
But like Kobo said, your not going to get an acurate buisness survey on a fourm, Mainly becuase you have no infromation of what your plan is. where do you plan to be located, what does the arena plan to look like, rules, price, store hours, ect, ect,