i've been on the phone with Phil today & he went some way into explaining the high(ish) entry fee
this is a very expensive meeting to hold & even at the raised entry fee there is still a large amount that needs to be found from sponsorship etc!
due to the troubled economic climate sponsorship for this event has been hard to come by & thin on the ground. you only have to look at the lack of sponsorship logo's on the event homepage compared to last year to see that! so the unfortunate raise in entrys was unavoidable.
on the plus side if you do get in you'll be racing on the best track in the UK against a very strong International field
i'm not sure on exact prices of onsite accomodation yet but the rooms are usually a lot cheaper than a hotel so the cost does even up a bit plus you also get cheap beer in the student union bar

so if you were really keen you could try and recoup your money like that
you also get the DXR guarantee that rain cannot & will not stop play!
you don't get that at any other dirt track in the UK