Never give things away for free, things for free are not valued.
Wrong!
Giving things away for free that are high value to your customers but low value to you could be a good way of getting in the door.
I wouldn't give away fascias cleans or driveways as they are to time consuming and would cost us to much in time but i think the cctv inspection could be a good one.
Lets face it you would go round and give someone a gutter quote for free so why not impress them with a quick glance into the gutters. I think its a clever ploy and may have a go myself

Quick Question for you: Who waits till Tuesday to get a but one get one free from dominos? how many people use the vouchers that come through the door every 3 months? how many people would use thier discounted deals they do?
Its all promotions planted there for one reason. to keep you coming back for more.
Free is good but only when it doesn't cost you to much in the process or only if that free thing leads to a lot more profit (loss leader)
One i always use is i can clean your gutters for x, i would normally charge you x for your fascias, sofits and gutters to be cleaned down to. and with this service we always give a 20% discount to have them cleaned together.
Seems to work on 80% of the quotes i do