What you need is a way to see if your investors are actually investors or just wannabees that will eat your time and or steal the deal, cutting you out.
On any "share of profit" deals you need to make sure you know the requirements of the "partners" and have them in written form. You also need to review with your broker... exactly want type agreements you can make for profit shareing... you may find the broker will not allow it or will require a percentage split over and above the commissions. ALL of your real estate activities come under the direct review and supervision of your broker.... even investments.
What you have stated is the exact thing that almost every agent will run across several time a week if not daily as I do. 99% of these are wannabees who will never get involved in a deal and or have NO MONEY or any knowledge of how to do non traditional real estate deals. In most Short Sales you will need Cash to get the best deal and in many that is all that you can propose... delays for getting financing, appraisals, inspections will kill most Short Sales.
Don't be suckered in by these "investors". Have them develop a formal relationship with you much like a Buyers Agent has and spell out everything.
It really isn't very realistic for a newer agent to be effective in this area of real estate or to deal with real investors. The skills necessary are far different than those of traditional real estate and most brokerages frown on agents doing anything except getting traditional listings. That is how most brokerages make their money from you activities... that is what they are in business to do.