1. No
5a. Yes
5b. Depends on the size of the venue, but in a 400 capacity venue we normally pay £3-400. We do however hire from a professional live sound company who supply nothing but the best - normally Turbosound but we've also had Dynacord, high end Mackie, HK Audio and the like. Professional standard lights normally run us around £1-200, that includes those little rotating head lights, strobes, hazers, spots etc. Both systems include operators and roadies.
6. We supply venues with a technical specification of what the band needs to play the gig, so that they can source the equipment locally. In this case, we don't include the cost of PA. We also let the venue know that we can supply the full sound and lights at an additional cost, so it's really up to them which they prefer. Normally they pay us extra to book and bring our own, it's just less hassle for the promoter.
I honestly can't imagine my band owning and operating PA and lights. Being in an 8 piece band, it's hard enough work lugging the backline around!