Tony, I dont know if changes to the tramp and boom is significant. Mast and daggers might be important. Has the extras really changed that often?

Good sails is a must in any class you want to compete, and do well in. Spis need to be changed often if you want to compete at the top level, jibs and mains less frequent. That is just the way it is. After some years the cuts stabilize, and you dont need to buy new sails due to advances in technology (whatever the sailmakers say).
Or you can start your own sail development program, learn a lot about sails and become a better sailor (time would be better spent on the water tough, if you have the opportunity).. Money to save that way, but you will need to work hard to match what the pros come up with. Good thing is that all they do are visible..

Here is a pic of our new (homemade) spi. We are having lots of fun working on how to get the best out of it.