the reason(s) why you may want to consider installing vacs:

Right now, there are tons of a/v jobs so it's a trade off whether to spend time doing a vac on your current job or just heading down the road and doing the next a/v install. I like to think that it will be nice to be able to count on the added revenue from the additional category on each job when things slow down.

You keep another contractor off the site that may have access to other products that you bid or similar items through a distributor catalog. It always sucks when some client or builder (even worse) thinks you are ripping them off when a moron vac/intercom guy tries to say that he can provide what you quoted for 1/3rd less whem he mis-quotes the extra parts that make it all work.

It's another category on your invoices, the dollars that they spend on this shouldn't detract from the structured cabling, distributed audio and theater systems.

Its dead easy, once you understand the concepts of keepinng the tees faced the right way to help the dirt get to the canister.

If you are pulling any significant amount of wire, you already have the Milwaukee SelFeed bits and a big right angle drill to drill all the necessary holes.

If you don't have a licenced sparky on your staff, find one that will sub for you (also a good idea for custom plasma retros) or have the GC call his guy back out on your dime, and the customer pays you or as a change order through the builder and the customer pays the builder) and piggyback the additional outlets and canister power.

It's probably the only subsystem that we install besides security that consistently has real value at resale, and they're better than any upright anyway.