If you really wanted to do some business, what might help is having some BIG snakes on show, or other reptile of impressive size, you'de have to have a pristine shop, clean,tidy and smelling nice as this would put people off right away if any of these things overlooked by you. you'de have a big electricity bill, and a big caging bill, and not to mention the reptiles and food bill, I would start small, even using your credit card, buy some grown albino balls or boas, even some adult hets, keep them and see if you have success breeding them, I guess you would make your money back in the first breeding season if you hatched a few albino balls from and albino to het breeding, maybe buying a pair of adult albino boas, yes expensive but if you havd 15 babies the next year you'de make about 15 grand at least, minus the food, elec, and cost of the parents.
I would start at home, you just dont see people buying many herps from stores anyway, just the odd sale, unless you have a huge store like prehistoric pets, now thats a store alright but even he started off small, and i can't immagine the costs of running that place.
Good luck, and this is just my oppinion, but you know, in life if we don't do what our heart says, or at least try something new now and again then why are we living here. best of luck to you.
steve