I dont know many wholesalers who work with realtors on the front end of a deal unless its a short sale.
There are some other mechanics that go into that type of deal and the realtor has to be involved because the deal can't be conducted without them because the lending institutions say so.
Not sure about REO's and wholesaling.
Are you buying fixers? Is your buyer a rehabber? If yes, I dont think the rehabber is going to want to pay the realtor's commission.
Also, and I think a realtor can best answer this question but if you are buying from a seller that the Realtor has a listing with, the realtor has a fiduciary responsibility to the seller (not to you) to disclose if you are not going to be the true end buyer and intend to assign the contract.
I think the general wholesaling rule of thumb is to NOT include Realtors in the wholesaling portion of the deal.
Its been my experience that a lot of realtors think wholesaling is illegal to begin with.
Have you talked to any realtors about it?