The greatest referral source marketing fallacy among professionals is the thinking that you can't reciprocate to some referral sources because you don't serve the same type of clients as your referral source.
Guess what? You can ALWAYS reciprocate. You probably just aren't thinking broadly enough. I'll explain.
Depending on your specialty area(s) you may not be in front of the types of clients that someone who refers to you might want to be in front of, but that is no matter.
Fact is, you probably know other people who know the types of clients your referral sources seek. Right?
All you need to do is connect people. They will take it from there. Especially if they are bankers, insurance or financial advisor types, and others who appreciate and "get" networking. You don't even have to pitch them or for them, they'll do all that. Just put them together.
Simply making the thoughtful introduction to another potential referral source will genuinely please someone who's referred someone to you. Of course, it's best when you think about personality types and consider styles that will mesh well, but if you're not sure, try it anyway. If you do it with good intentions, you will likely receive appreciation from both parties no matter what the outcome.
So don't get stuck thinking your clients aren't right for someone who has been good to you, so there's nothing you can do. Think deeper to determine who else you know and whom they know.
And don't forget the power of introducing clients to other clients, either. Especially when it makes sense for them to do business together or benefit in some other way from knowing each other.
Clients are your primary referral source and they will both appreciate you thinking of them and will probably be happy to reciprocate.
When you connect people together, you have done something very valuable. This is the essence of social capital. Give it whirl!