STW, you want facts.
At a focus night a few months ago, one of the GC gave an exact number of G days utilised in the previous 12 months. This was a factual number from the company in a JRC meeting.
The exact number is a bit foggy in my memory, but it was about 1010 - 1020. I do remember someone using the calculator their phone to divide it by 365, and the answer was 2.8.
That's 2.8 G day workers EVERY SINGLE DAY OF THE YEAR, or, 5 every 2 days. Obviously that's an annual average, so during quieter times it will be less per day, and during busier times more.
If those 2 or 3 guys would stop helping out EVERY DAY, then either flights would be cancelled (less likely) or they'd be forced to use reserve coverage and pay EFP to people on reserve (more likely). Either way, it would be an increased burden on resources.