Terry, your intent isn't entirely clear, because the way you framed your question leaves room for lots of (mis-)interpretation. Several of the agents here have interpreted your question as a request for dual-agency. However, I (as an investor) see a few other ways to interpret your question: 1) a wholesale or assignment transaction, 2) bird-dogging combined with using your own buyers list, or 3) a flat-fee listing combined with wholesaling or using your own buyers list.
In any case, I don't view the situation as an either-or one. Instead, I view it as a both-and one: I like to structure my transactions to have the maximum amount of exposure. Stated another way, I do all of the above--not necessarily all at the same time. Whether or not I work with a flat-fee listing service or full-service broker, I'll provide him/her/them an exclusions list if I already have a buyers list and/or other self-placed advertisement (that's specially coded so that I may track the buyers' information source) in place.
The reason I do things this way is not to "save a buck"; I view co-broke, referral, and other fees simply as some of the costs for doing business. Instead, I do things this way for 2 reasons: 1) to maintain a certain level of consistency (since I invest in multiple markets, and since agents/buyers in different areas are used to various local customs), and 2) to maintain and further develop relationships that I already have. After all, sometimes a broker on one deal might become a co-sponsor or one of the investors--as well as the broker--on another deal. I'm perfectly fine with this, and I make sure that we'd disclose all of this (via the PPM) to any potential participants for that deal.