In addition they paid for marketing expenses, bandit signs, and overhead in exchange for a commission split.

You are bringing the buyer (yourself) and will earn a commission for bringing the buyer.

These guys use hard-selling techniques and if they make enough phone calls, eventually they get someone to purchase a stock and make their commission.

We both work in sales and they refuse to factor in any of our commissions (which is about 30% of our income ) even though they've been consistent for years.

I'll gladly sell at retail and take a commission on top of that.

It is always offset by things like taxes, fees, commissions, etc., especially if the valuation is on an unrealized asset.  

so a while back i asked about laws governing realtors who wholesale as well. there was a lot of responses so i figured i would go ahead and ask the South Carolina Real Estate commission what there position is on the subject.This is basically what i got back (nothing edited) its kind of long. 

Once you sell a property, you share your commission with the employing broker, who can take 50% or more of the commission.

Occupancy Status (preferably a Rent Roll) Rehab Estimate (vacant or if tenant leaves) Market Value (based on sold comps) also known as ARV (After Repair Value) Current Manager Assignment Fee / Agent Commission Back Taxes / Liens / Mortgages Owner Financing Availability Closing Time Frame Photographs Leases and Tenant Ledgers

We made about $31,000 after closing cost and commissions.