Don't know about the C grade side. A poster that 'may have been heavily involved in higher grade flags' is though... but who knows, maybe a long term mediocre C grade club is jealous of a club that has experienced sustained success
I can safely say if you poll all teams in C section and gave them a choice of staying in C or drop down 3 sections and win 3 lower grade flags, I can guarantee all clubs would stay in their current grade.
To suggest a higher grade club is jealous of lower grade premierships is just plain dumb. Sorry!