Talking of narratives here we go..........
In modern history the ground capacity hasn't exceeded 40000 is probably why (currently 37500) it held briefly 40000 before Ken Bates put his executive boxes in, but then you're subject to away attendance.
Prior to Don Revies era, Leeds was not a footballing heartland, nor were many towns along the M62 corridor.
Why didn't Sunderland achieve an average home attendance of above 20000 through the decades of the 80s and 90s?
Edit to say - it also seems your current attendances are skewed too, lots of people not turning up it seems, and issues with adults buying kids season tickets, then not being arsed to turn up as it didn't cost them much anyway.
The play off attendance will be interesting when people have to pay full whack - but even then it should be a sell out for such an important game.
It seems you have an unhealthy obsession up there with attendances holding up to your neighbours levels, local pride - I get it.