Well for a start it is illegal to do so...so I wouldn't advise it. They are an endangered species, and the exotic animal trade is a very cruel one, which is connected to the illegal drugs trade. So you purchasing a sloth or most other exotics could easily result in you furthering the illicit narcotics business in Asia and South America.
Sloths are STOLEN from their mothers, and to do so the mother is shot, which as I'm sure you appreciate, only exascerbates the situation of species endangerment.
If you proceed to purchase one, you must understand what consequences this has on the future success of the species and the criminal activity involved.