So what, this happens everywhere in the market. Why do you think small stores and bodegas put a minimum of $10 for payment via credit card? Because the large chain stores get better rates from Visa and Master Card. Many times I go to Starbucks instead of some small cafe when I don't have enough cash because I know I would be able to pay by card.

Shipping companies offer better shipping rates to commercial companies than to a small startup.

This is just called 'price discrimination' and is a very valid economic concept.