Even if you get the client to sign a declaration that he knows that RMAs will have to be run through the guy he buys it from, the illogic of us people-types is that the last guy to touch it owns it, problems and all.

That said, it seems to me that showing Crestron's written warranty policy to the client, and having him sign such a document, which would include disclosure of your labor rates for all troubleshooting, removal, shipping, replacement, and reinstallation at least gives you something that you can remind the client about.

Tell him before he signs it that it's the nature of the situation that you are very sensitive about these things as they cost you money down the road, and you're just trying to have the client be equally sensitive to how his saving money now will cost HIM, not YOU, money down the road.

Then go make some money.