I guess repeating this again is necessary after all:
There is no argument as to whether working G days is allowed or part of the RP's, etc....The argument is that it is 100% in the power of pilots not to respond to such requests and to let pilots who are on duty (R days), including themselves when it is their turn, make many more times that the small G day callout payment for the same amount of work.
Either you make your time worth more money, or you make your time worth less money. Yes, the choice is up to you, and was agreed to by the majority. However, nobody HAS to take them up on their tiny offer, but for some insane reason, many do, costing themselves and their coworkers a whole lot of money over the year.
Someone's voluntary choice to deny me overtime while I remain on duty (most often for free), just so they can get G day callout pay, certainly does bother me and I certainly do oppose it.