Regardless of how much BG are paying them. A service is a service, unfortunately not everyone does them correctly or to a level that is seen to be (in my opinion) correct.
Not with BG it isn't! They offer a "generic" service for a room sealed appliance. Which is:
FGA
Burner pressure or Gas rate check.
A general dust.
That is it. So BG are lying when they talk about a "service", and they don't pay enough for or EXPECT a full service.
a service should really be what it states in the MI's. Unfortunately BG follow their rules and get away with it. They have some very "interesting" engineers working for them.
I would personally carry out a full service to my standards regardless of the amount being paid just because im like that. A little self pride is always a good thing...
But not everyone takes the same approach.