Quote: Pieman "but why arent people from other clubs going anymore?'"
Personally I think there is more to it than just the cost, it is more about the perceived value.
By that I mean most people will spend more than they should on something they really want to do, but once the magic of these things disappear then they start to appear too expensive or too time consuming.
Trips down to London were very rare when the habit of going to the Final just for the game (and not being a supporter) was established. Over the years this habit was kept going by the fact you knew when it was happening, where it was staged and the fact that pubs and clubs would set these trips up.
Over the years the trip to London has become more common place and less appealing
The final itself has been moved both venue and time
There has been another final to rival it that follows very closely behind
The introduction of SL has diminished the importance of the CC
Pubs and Clubs are disappearing and are not organising this type of trip due to the lack of locals
The supporters of the finalists are still willing to go and spend that extra - but not as many neutral supporters
All of the above has an effect on the mindset of neutral supporters - take one in isolation and you can deal with it, all together and it needed some smart marketing from the RFL to get over this size of a hurdle, and while they have tried they have failed.