I have booked many a holiday abroad (package deals to Grease etc), worked out the costs, paid the deposit only to find out months later when I've come to pay the balance that it has gone up because of one surcharge or another.
It is written into the small print for all holiday bookings, whether package deals through a travel agent or camping/caravan holidays booked through ANY club that they reserve the right to alter the price up to the day of travel to cope with the fluctuating markets.
I agree with everyone that it is frustrating to have to pay more when you thought everything was calculated and sorted months before hand, and if this extra money was lining the pocket of some 'fat cat MD' then I would be the first to cancel, resign from the club and hold a placard up on the street corner displaying my annoyance.
However, as has been pointed out, if the price of a foreign booked holiday increases, beyond the control of the club, for whatever reason, then it is only right that the members affected pay the difference. I certainly don't want to pay extra for someone elses holiday, any more than I would expect anyone else to pay more for my holiday.
We have to be realistic, frustrating as it is
Phil