@Ron T. thanks for those thoughts. I posted this discussion knowing it would likely get some pushback. I think the result has been to clarify some things in my own mind, which has been very helpful.
I think there are two types of investor clients I've had over the years - the ones who place disproportionate value on "deal-finding" from the realtor and those who view "deal-finding" as just one service (and probably not the highest on the list) that the realtor provides.
Those who view deal-finding as one of the many services a realtor provides recognize that not many realtors can provide the expertise, knowledge, and connections that I can. (Hopefully, that doesn't come across as pretentious. I don't usually compare myself to other realtors in this way.) For instance, I just had 2-hour conversation with a repeat investor client where we were analyzing a few properties on some very specific cash/cost-related criteria, developed a game plan for diversifying their real estate portfolio, and at the end, I was able to provide the data (without having gone into the conversation prepared to provide it) on what the average appreciation of a specific subregion has been the past several years and how that compares to the average for the area. These types of clients find considerable value in me being able to have that type of discussion and bring real knowledge to the table, and they know, by virtue of my knowledge, I will be able to identify deals for them.
On the flipside, in my experience, those who prioritize "deal-finding" tend to want the realtor to be something of a news reporter, where whichever realtor "breaks the news" first (in this case, is the first to present a deal) is the one who gets the transaction. I can set these people up on automatic MLS emails so that they get emailed the moment a property in their search criteria appears on the market, but I've found if I present off-market deals, they will eventually find the source of the off-market deal (often a wholesaler) and just go direct to him/her. Eventually, they build their wholesaler rolodex large enough that it's extremely difficult for me to be the first to bring a deal, unless I am the wholesaler (something I intend to do more of in the future, for this very reason). If they truly do believe that any realtor can represent them and that I don't bring value beyond simply being the first to present a property, then I absolutely understand not being willing to sign an exclusive agreement. I think I need to have a clearer value proposition for them, and that's something I will be working on as part of this.
On a semi-related note, I find that the realtors who tend to be the "breaking news" types present a lot of bad deals to their clients because priority is given to being first over being good. I only present deals to my clients that I can justify, and I will talk my clients out of "bad deals," unlike the majority of the others (who normally can't fully articulate the difference between a good and a bad deal). Again, that may not be valuable to some (maybe even most) of the RE investors out there, but this is how I feel it's best for me to do my business.