I would love to have a Desmo, but I don't see ever trading my R for one. Neither bike is a good daily rider in traffic, and the Desmo less so. I get glimpses of the brilliance of my R in canyon riding and know that to really appreciate it to its fullest, I need to track it. I have not ridden the Desmo, but from what I have read, the Desmo is even more like this. If you cannot ride the bike in the element, or in the way it shines, will you find enough enjoyment in other ways in order to be happy with it...the excitement of being on it, the sound, the exclusivity etc.? If you're going to always have the feeling of, "I always wanted one of those" whenever you see one, then you should go for it. You only go around once.
If it turns out to be a mistake, you deal with it then.
By then, maybe I can afford to buy it from you.
btw, my R is far superior to the 1098S I had.