I was planning to do this, as I've enjoyed the last couple of times I've been. Two things put me off. Firstly, having to make a call between sailing 2-up in a tiny fleet, or 1-up in a decent fleet. If there are only 3 boats on the handicap start, can they not just go with the single handers? You can still score them separately.
Secondly, pre-entering. What is the club trying to achieve with pre-entry? Other clubs do a non-committal on-line registration, which should give a decent rough idea of numbers. I certainly won't be pre-entering before the Thursday, and even then it reduces the chances of me turning up.
Paul