Sell ​​your service!

I am a developer. From time to time I have orders for creating websites. It is not a secret to anyone that serious cooperation with the client does not end with the development. Appear technical support and promotion (development) of the resource. Previously, I somehow, without thinking, gave the whole thing to my acquaintances, who for “thank you” began to “move” the sites, receiving their rewards for this directly from the customer.

But sometimes the freebie ends and now I want to get my percentage from it. Accordingly, I need to hire an SEO specialist who will work on my projects.

What did I do for this?

I talked to one Moscow company and talked to two freelance friends who also do this type of activity.
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My conditions for this were simple:

- Sell your service to me so that I can vouch with the customer “with my own head” that his project will be developed, he will be able to get the advantages he needs from him and why you need to continue working with me (with you) in this direction, and not with anyone else.

In response, I received a bunch of "Water" and, accordingly, did not buy this service from them. I will not specifically say what they were trying to “dissolve” me (it was this impression), but I want to ask ...

Can you sell me your project development service? If you can, how?