don't buy their equipments.
I called several specialized theater-build companies and asked them if they can convert one of my room into a professional looking theater room but do not include the equipments because I already have all the high-end equipments (speakers, receivers, projector, screen, seats, ....etc....) but they denied my business with them because they say that they would not do it if I provide my own equipments.
They states that it would be like me going to a restaurant and wanting the chefs to cook the raw food that I bring in....
I understand that it would be easier to build a theater with the equipments that they are familiar with or that they want to make more profits by selling the equipments but can't they compromise and at least make some money from just the theater room build (such as for the labor fee)?
I am so incline to just build my own and hire people to do part of the job that I cannot do.