There's pretty much no way a client can buy every single piece of Crestron equipment, unless you gave them a detailed "shopping list".

The thing to do is make them aware that you are not responsible if anything goes wrong with the hardware. If a processor or interface goes down a day after you have it fully-functional - they have to deal with it, pay you to remove it, ship it back and reinstall it. If they buy everything from you, let them know how you will support the hardware if something goes wrong.



Thank you,
Damon