Yes £2 was a bargain, but don't forget that all the Djs gave their time for free for PTPs 50th birthday. Most of us don't get paid too often anyway. At Soul in the City we always paid our guests, except at our All Dayers which were either free entry or in aid of charity and that included the likes of Kenny Burrell and Ady Croasdell! When turnouts are poor I've waived any promised fees as well. It's nice to get paid and most promoters do pay when they have a healthy turn out.
I've only been to one do this year which I thought was overpriced but it was still a reasonable per hour cost. £10-12 for an all nighter isn't bad all things considered.