I think after expenses/running costs all remaining money from gate receipts for the play offs goes to the RFL.

They are about a ten minute walk away, I remember some opposition fans proper moaning about the distance at one of the first games

Correct.
It's then divvied up after the Grand Final dependeing upon finishing positions AFTER the play offs.

The coaches now park on the car park at the back of the North stand.

Well I didn't know that. All the moaning must have worked, strange that the signs are still up on the old location