Maybe it is naive, but we supply Apple TVs on most jobs. We mark them up something like 25 points, and every couple of years we have to warranty one or two (out of 100 per year or so.) It isn't a big profit center for us or anything like that, but it is a service to our clients. We deliver a turnkey system, including TVs. TVs are a huge pain, but again, we still make money on them on the net.
Turnkey systems are a valuable solution for our good customers, and the minor risk of providing these low margin items is made up for in goodwill, larger installs, more control, etc.