personally, it looks to me like a lot of money was saved on the line up...
...but
everyone is going this year, for some reason. possibly including me (depending whether there are cheap flights from cairo, which i wont know til after i get there).
i already bought flights london (after work friday night, arriving in time for party) - berlin (leaving monday morning, early) - london. PM me if you'd like them - pay the change fee and they're yours.

theyre with ryanair, if you want to check what the fee would be.
ive got a single room (shared bathroom) booked at the 3 little pigs hostel, across the road from the congress venue (still 5 to 10 minutes' walk, since the congress hall is in a park. next to a lidl supermarket that actually sells some really nice food, cheaply. last time i lived on emmental sandwiches, chocolate-covered marzipan and apple crumble cakes...nom nom. whole food for the weekend cost less than 20 euro). total price for all of the 3 nights, 122 euro. ive stayed there before, and it's basic but fine.
if i dont go, someone is welcome to take my room (pay on arrival). i wont know for sure for at least a week though, sorry (need to land in cairo, find a flat then look for cheap flights)...