Pay for performance. 1st one is always at full price, if you want to discount a bit on future deals is your decision depending perhaps on the volume and the amount of work required. I work with lots of investors and it's rare they get a discount. I find investors are just as much work and sometimes more than a regular buyer and seller. They want to suck my brain for lots and lots of information. That has value. If they don't value it that, then probably not a good fit. Occasionally there are some that don't ask 1000 questions and are pretty self sufficient, just trying to maximize their time and network, so those may get some consideration. They also get 1st crack at the pocket deals.
I would also say while I have seen very few exceptions, for the most part discounting just doesn't work long term. The people that always discount just don't last. So if you start dealing with people who are transactional focused, they won't value relationships and loyalty and always find someone cheaper and will bail on deals that are good, chasing one that is cheaper and cheaper. Their rehabs will be cheaper, they'll go with the cheapest loan which will cause you more headaches and time. It just becomes a downward spiral.
For the most part now you MUST sign an exclusive agreement. Can't show a buyer a house without it, as I understand.
To me you either add value or you don't. If you do, you have to prove it. Maybe moreso today. I do my best to keep my investor clients out of trouble. I save them plenty of time and money with trusted vendors. I work with the best in town. Real Estate is a team sport. Long term success means having a team of CPAs, Attorneys, Title Companies, GCs, trades, roofers, cleaners, lenders, and so many others on your team as an investor.
Good luck. Stay Strong.