Years ago, I was involved in a project that hoped to solve problems facing retail bankers: how to improve customer loyalty, and, not incidentally, how to keep bankers from burning out as they ran between being super sales people, and advisers in the incredibly stressful world of complex financial decision-making.
A core issue was defining the relationship bankers had with very profitable, loyal clients. How come these customers thought of themselves as the clients of a professional and happily took their advice with no questions asked, while others made decisions based on price and cost the bank a ton of dough?
How could the relationship be more like the one you have with your dentist? When the dentist recommends cleaning, filling or even root canal work, we might blanch at the cost, and we might negotiate it if we don't have insurance - but we still buy with no questions asked. And we don't tell the dentist what to do as she works, or change the specs on the job have way through or decide at the end of the project we're not going to pay, or even switch dentists in spite of the discomfort of having the work done.
There seem to be four key attributes, and I'll bet the way they are familiar to you from working with the clients you like best.
Trust: your client trusts that you will keep the promises you make, and act ethically. You trust that your client will do the same.
Superior Knowledge: you have the requisite expertise in your discipline or business to perform the work. Your clients accepts that you know most about the product or service, and feels no need to challenge that knowledge. You accept that your client knows most about his or her needs, and feel free to probe for understanding.
Process Credibility: the fit between the result you promise, and the means you use to achieve the result makes sense to your client. The fit between your clients' actual needs, and what they ask you to do, makes sense to you.
Single Source Accountability: when something goes wrong or there is a problem, your client holds you accountable - no questions asked, no excuses offered. When your client sees fit to inquire about the work, he speaks to you, not a "Stand in". If there is a problem in how or when you get paid for your work, you hold your client accountable under the same terms.
I'll leave this post with a couple of thoughts for you: do you have any relationships like this right now? What would you have to do differently to create this kind of relationship with more of your clients?

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