I think some people are making some very negative comparisons concerning costs.

The entry-fee for Eurocat at Carnac is more expensive (for 3 days. Maybe 6 laps and 1 long-distance if you're lucky.) then the entry-fee of the GC.
Entry-fee of Texel ... + ferry to the island !
We also have 1 or 2 day events in Belgium that already cost half the price or more then the GC.

Next to that I must say that you always have to take a lot of extra costs into account if you're going abroad to sail.
I think it's even better to have 6 days of sailing instead of 4 because the major costs (transportation/accomodation)will be exactly the same.

Last thing, I'm guessing to pay € 30 for a hotelroom/night + breakfast. add € 65 to eat+expense/day and you'll be around € 100/day * 7 = € 700 (+/- £ 500 ?).

(What about hiring a big appartment with a couple of teams to reduce costs ?)