I remember going to Luton around 1981/2 and paying ??2 admission for the first time ever. All the Bolton fans were complaining about being ripped off. I think ??1.80 had previously been the most expensive.
When fans were complaining about prices a couple of years before that, Ian Greaves, in his Evening News/ Buff column, justified the the prices by saying that they equated roughly to 4 pints of beer, which he said, had always been a good yardstick. It must be about 15 -20 pints to get in now on that scale.