Yes unless you are a racer on a budget that has to stay on the cutting edge to be competitive, it's good to see regular updates. While they aren't great compared with newer models, my r1v1 kites cost me a fraction of new and have taken a plenty of my abuse tacking and gybing. As long as the longevity doesn't continue to be cut with lighter and lighter materials, there should be good deals that filter down the latest tech. I'm going to be looking for some Sonic 2 now that the new model is out from Flysurfer.
I wouldn't say that the secondary market is artificially high unless Ozone, Flysurfer, and F-One are buying up used race kites to burn and keep them off the market. The price is high to begin with (but people will pay it) and the market isn't that big. Its smart that they build them to order but there's quite a few people on the payroll to sell a niche low volume product so I guess that's what's driving up the price.
I've heard that with one the F-One designers leaving with Nocher to form Enata (with essentially what was the Diablo 3), F-One is already working on the "Diablo 4," skipping the 3 and trying for even more performance. Or, maybe it's all hype