I guess when the magic becomes familiar it breeds contempt. And the fast-talking "drummer" (to use a very old slang term) moves in like a hyena after a weakened wildebeast.....
I've seen slick sales people con people (including) me away from the best alternative, to their own product. Our current alarm service is worthless...and we were fools to sign up with them. At the end of 3 years, when the contract expires, they are GONE whether they like it or not--and they are a major "reputable" company. I've seen condo associations where people sweet-talked their way onto the board promising to protect the 400 homes in the association...and then concentrate on protecting their own, to the detriment of the 399 others. (We swore we'd never buy again where there was a mandatory home-owners' association of any kind, other than the town itself.

Carl