I would think this could be a great hobby, but with everything and everybody having apps for everything sold now most everything is automated " good enough" for the majority. I find it rather odd that there's only 1 IP/ TV brand out there. I'm doing my first full "Job" for a friend who had multiple quotes and just for the Security Camera end of it the price was 8K. As a favor I am just having her switch out to all Mac products first and foremost just because their stuff plays so good with it self. Between Airplay, Airport Timecapsule/Extreme/express, Apple TV, DirecTvs new Genie with Client and Insteon/ISY994i I can give her pretty much everything, everywhere for her Home/Business that spans across three buildings for less than 8K and she gets a new iMac and Macbook pro included in that price. I just use iRule and whammo done and fast.
I just finished an 11k sq. ft home with 2 theaters fully 1-2 button operational including lighting scenes on Pause and Play and Blackout shades, 3 other media areas, whole house lighting Scenes with 150 light switches, whole house audio zoned/ garage doors/ Security cameras and everything can be done from an iPhone/iPad Mini and the iPad Mini is a Dream in this market
I would think the main problem is dealing with people that want to Play around in their network settings, if you would completely lock out the customers ability to " mess " with stuff I would think you would be fine, I have an electrician friend that owns his own company and wanting me to join with him in installing/programming as part of his package and I just dont' have time but I told him I could train one of his guys in a couple days and he's set. The problem is I got completely away from Windows and PC all together so this would be difficult for me to assist him with 99% of his clients/bids since I don't deal with Windows nor Android anymore and most people own these. I still own both products and have a great time playing around in Windows8 laughing at what a garbled mucky mess it is but........find a solution that's rock solid or your support calls will be the end of you I would think