The obvious question would be why would anyone who is buying in volume not want to deal with a wholesaler direct to ensure the best possible price?
It might only be $10.00 a unit you want to make, but that spread over 300 , or whatever amount of units would be quite an out of pocket expense for the buyer to absorb.
Any business man willing to purchase any product in volume at an above volume price probably shouldn't be in business, and probably won't be for very long!