Holy Order Sol
Member
They enjoy the scene, the community, the drama, the emotions, the things that surround it.
Well, that's what was sold to people in an attempt to grow the community at all costs. Little emphasis over the years on why playing the games is interesting since that's a hard sell, much more on what you described. Those people get everything they wanted from fighting games before getting to the part where they need to invest anything, so they don't have a reason to.
The FGC to them is basically WinRar's free trial.