Why are people continually arguing that it's a decent price to watch Man Utd?

There's a lot of good and valid points on this board.

On the one hand "its only a fiver"
on the other "its the principle, where does it end?"

it's just capitalism. The aim of the club is to maximise revenue (like all clubs).

Sometimes its £10, £15 and now it's £25.
The Cup final will no doubt be more expensive.