Which club? Also what does 600% represent, I mean if you are paying a ridiculously low rent then welcome to the real world, if however you already pay market rate then you got reason to bitch.
Problem with the idea of a rise in the rent is that it may have been put up without any consideration as to what the place might otherwise get. Your club land may be very important/valuable to you, but fairly worthless to anyone else. But some beancounter with a brief to maximise asset income (and who knows, a percentage...) might not have researched that bit. "Its paid for, so its worth something, so maximise that something".
The club is the Hurlingham yacht club in Putney. The rent for our pontoon, which we installed, is to go up by 600%. The pontoon is only three years old so is not an old lease unrealistically cheap at present. What made them decide on 600%? why not 1000% or 200% there is no rime or reason to it. Perhaps the new board member, an accountant, that has turned arround several companies in the past
feels 600% is required to pay extra goveners dividends.