A) it's been going on for years, 20 years ago had my stag do at a festival - lots of abandoned tents then - we from failing 'memory' had bought (£30 ASDA) tents which we may have left? (apart from the one that perhaps got set on fire for some reason, it had apparently been destroyed by some drunk person high jumping into it. It was not one the 'quality £30' tents - it was one that someone had borrowed

B) - even back then there was a charity that 'recycled' them - we left the tent bags and everything useful in the tents.
C) The 'festival crowd' has changed - when I did go regularly (mainly Reading, though Glast and Phoenix) most people went for the music primarily and go each year or multiple festivals, so keeping your tent made sense - now it's a place to be seen - dress up / down regardless of the music - my 18 year old went to 'Leeds Fest' & stayed in a hotel
