The kleptos aren't new; back in 1973 or so the ticket consisted of an ocarina on a string; my toddler was wearing mine and some thief - the devil fetch him or her - stole it, a particularly nasty thing to do. In those days, I think you bought the one ticket for the whole weekend so I was trapped on site till the festival ended.
The festival now looks a bit too industrial-level and trendy for me. I'll be at a quieter one near Tours around that time.