It can make sense to use the original Manufacturer, however there is no excuse for charging a commercially realistic fee to a builder for the installation, but charging 4 times that price for replacement equipment after a 1 year warranty.
Certain companies often sell equipment at cost price for large shell and core installations, and then at an exaggerated profit to the end user, and to those fitting out floors.
It does make good business sense, but I have seen many cases where it means cutting corners or "Skimping" on fire safety.
I even know one building with a "Closed protocol" Analogue addressable all singing and dancing system.
The building also has 18 small conventional systems all linked into one large conventional system, as single zones, which is fitted next to the addressable system, with a single link indicating alarm. All fitted because it is cheaper to install a control panel, 4 detectors, and a link through 6 floors, than it is to install 4 detectors onto the addressable system.
The Sounders are operated by the Addressable system in common partes and in open plan floors, but by the small conventionals where floors have been compartmentalised.
Horrible.
Back onto BikerBoys original comment, does anyone have any information on the ADT cout case?