First off let me say I am no ATC controller!
.........and believe me it shows
I always notify of altitude changes when flying around Matz areas and when using a RIS/RAS but hardly ever on a FIS
In which case you are doing what you are required to do. On a FIS as ATCO's we're not really interested unless you're in a position where we'd like to 'level cap' you against IFR traffic. RIS however you're meant to tell, RAS it's a good idea to request.
But as others have said, we're not the police (Unless it's a blatant breach of legislation - then it has to be reported by us). You as a pilot are meant to have the personal responsibility of how to conduct yourself within the law. To be quite honest we have better things to do (like providing the service) and just end up being witnesses sometimes should you transgress the rules seriously.