Jupiter Wholesale would not increase your sales potential. They are a middle man dropshipping stuff from other dropshippers.
All their leather goods come from a company called Maxam/BNF.
Jupiter Wholesale looks like it's adding 20-50% on top of the actual wholesale price you can get from BNF.
BNF is a dropshipper also, but they have a pretty hefty fee for orders under $25.00.
Good dropshippers that everyone and their sister aren't already using are pretty hard to find. The profit margin is generally pretty low and there is always the chance of items going out of stock and you being SOL.