Incentives work just as well for wholesale buyers as regular people. Some wholesale stores will give buyers discounts based on how many items they buy. A common offer is a discount on the first order of a new customer. Among other things, you could offer:

Low requirements for placing an order
Free shipping depends on how much you order and where you want it sent.
Various payment options
Whole sale deals
Tests and samples that are free

As a wholesaler, you could also offer drop shipping. When a company sells a product on its website, you deliver it to the end customer instead of a wholesale distributor, which could be cheaper for the company.