Completely agree duffer, but perhaps if I may from a slightly different angle, being fortunate enough to take my son to games as a season ticket holder.
The "walk up " charge feels almost like a stealth tax on those who aren't able to plan their weekends/day(s) due to circumstances X,Y,Z often beyond their control. As a season ticket holder (Seats TBC for this year)- the benefit of having a ST isn't just cost/game reduction alone, the 'package' around it, perhaps the softer aspects outside of the monetary gain shouldn't be underestimated: A known seat, a known "neighbour", no stress re ticket collection for games, priority allocation on cup games and away fixtures etc etc... to some these might seem trivial "benefits", but not in my experience. And so based on your cost analysis, but from a slightly different perspective, I would welcome the fiscal structure you propose.