I personally represent all commercial real estate and am looking to grow the group with more real estate contacts (Note: There is only one member in the group per profession, and we already have a real estate agent joining the group).

Exclude the ones that were sold on MLS that may be fixer-uppers, for example, a SFH sold at 40K, because that doesn’t represent what a comp would sell for after repair.4.

Other than the general line "that properties listed with a Realtor sell for more," it really comes down to are you comfortable representing yourself? 

We represented ourselves.

We represented ourselves and wrote up our own contract for deed.

Builders reps are always nice and friendly, but they represent the builder not you.   

I know how a traditional home purchase works in that when he represents me as a buyer's agent he gets (usually) half of a 5-6% commission on the price of the home I buy.

Welllllllllllll, there are ways to figure something to get you more, but you'd need to have your friend threaten to get a broker to represent him and they may be more generous.Problem is a lot of listing brokers are pretty much straight-out a-holes when it comes to comm splits.

However, keep in mind there are lots of Agents on these pages as well who represent Buyers so you may want to say "Principals only" if the Seller wants to avoid paying a Buyers Agent fee.

If I represent both, I don't need a super high commission to get the deal done.