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How successful is an exotic reptile shop? What does it take? - exotic reptiles for sale

I think the "reptiles" category is better, in the case of "little" article does not answer questions.

I have a small retail space in a mall and you want to open a shop of exotic reptiles, since there are no competitors in this sector. The monthly rent is $ 5,000 per month.
What makes money from a reptile shop more ... Supply or sale of animals? For a reptile shop to the success of the rental must be below a certain amount, like $ 3k or not?

Thank you!