Some states' Real Estate Commission website will list software companies that meet your states accounting requirements.  

We tied the parcel up for basically nothing, and used our commission as a down payment The seller had some terrible concept drawings, that we knew we could rework and did.

If you're just looking for an agent to submit your paperwork in large volume, look for a new agent who is looking for any way to make a commission.

We ended up working out a buyer's lease for a month because the mortgage company required one month's pay from that dealer to establish employment as I was commission based in the service department.

How long of a vacancy before you can hire somebody else for leasing and not owe them a commission?

There are also lots of PM companies that will find good rental properties and just take the seller-paid commission as compensation (and they have great incentive to do a great job to obtain and keep your business over the long haul).

Realtor commissions are 6%, so it is an easy "known" cost.

the only difference is that more of the "profit" or "commission" goes to the broker vs. the bank.  

You should be able to make at least a 20% gross margin between the cost of the dirt/plans/house and the sales price after commissions.  

It can put you out of commission for a long time if all doesn't go well.