They aren't it's just what your local security companies are using. Premier and Galaxy are probably the two most popular panels.
As for your arguments towards becoming a security company, it's no laughing matter. There are lots on here that are unhappy with the way the industry is heading, most customers want stuff for buttons. Companies here are having to branch into other things.
Security regs are equally as complicated and get there goal posts get moved every few years.
The industry has lost most of the domestic market due to DIY/consumer tech/handyman fitting systems for buttons. Potential customers want "an alarm" or " a CCTV system", they don't consider the difference in quality of a professionally fitted system.
I would we suffer a lot more heavily from "one man bands", approved companies work to a standard and pay to be audited. This allows anyone to easily undercut you on systems by ignoring the standards. (I must also point out there are non-approved companies that are professional and there are approved companies that install poorly).
Yes, I agree you have your reoccurring maintenance, if you have a good estate, which keeps most companies afloat.
Do you not arrange to check electrical installations every 4 years anyway?
I am not trying to put you off, I wish you well. I am just pointing out it's not as easy over here as many seem to assume. I certainly wouldn't recommend it to anyone.