The formula for my obsession is ..
1 cup of A father who still has his bike which he bought from the showroom in '78
2 table spoons of fond memories being picked up from school, going to footy or GP on the Z
1/2 lb of getting into later teens and watching Gobert sliding that 7 to oblivion and other talents like Akira Yanagawa in WSBK
3 teaspoons of just general appreciation for their colours and styling of the machines.
2 cups of total admiration of a manufacturer consistently punching above their weight.
1 good handful of utter distaste for HDs
With that said though; I've owned 2 Yamis, 2 Kawas, & 1 Honda. I wouldn't rule out ever buying another Yamaha especially if its another dirt bike but heart will always remain green.