What a shambles ! Just go stand in line when it looks reasonably OK and pay on the door one in one out. It'll be absolute chaos until much later on in the party but I can guarantee thousands of people will pass in and out of there and get so hacked off with the cumulative impact of crowding, heat and drugs by 6am they will flake on a grand scale and be falling around Bossa saying it was all just too much but at least they've ticked it off their bucket list. Especially if they're there with their other halves and in particular if they've been on the jack & jills. Just think it through !!! Relatively few of them will have the stomach for another 100 Euros a head on the door to go back in later, which is when the best times are almost undoubtedly going to be there for the taking.
If the party is to go on all Monday it's a cash in hand bonanza on the door for the last time and I'm pretty sure thousands more will be admitted on Monday to make the most of it, provided the authorities don't decide to jump in and close the party down early - which they don't usually do for closings. In the context of the amount people are going to be spending going out for this closing weekend, is a 40 Euro or so surcharge on the door really more than a drop in the ocean in the wider scheme of things if it came to that ?