Yes, I believe for most of us it is more about money than "Ultimate Performance". And as we saw with the Inter 20 class here in the States, too many boy-girl crews think a 20 footer is just "too much boat", thus they are moving to the f18, even though it is rated slower than the 20, and just as heavy, and nearly as expensive, actually more expensive really, if you are comparing a new F18 ($15,000) to a used I20 ($10,000).
Of course a new F18 is going to cost more than a used F20. It is a supply demand thing - There is no meaningful class and that will kill any boat's resale value. How do they compare new vs new???
Btw - I would love to go F20 racing but the costs are prohibitive at the moment.
Tiger Mike