Alas, that's generally the way things are these days. It's not unique, that's for sure. It comes down a lot to liability issues. It's already hard enough keeping your own ones managed let alone getting tangled up with another vendor's gear, implied or otherwise. The sad voice of experience there
Perhaps best to kill the thread (or just let it die off) and we'll bring people into this one so at least there's a more positive atmosphere here
One thing I was thinking of doing slightly differently on the larger BAC's is to have a detachable alarm/piezo so that people can pick/choose the loudness/size they want to use (also cost).