In terms of your "Live to Ride, Ride to Live" comment I agree with you.
I don't think there's any evidence to suggest passionate motorcyclists are dramatically more passionate than car guys. Lots of car guys have their entire identity tied up in their choice of car and bury themselves financially to drive that car and are pretty much obsessed with it.
I think that on average, car drivers are less passionate, as most are using it for utility. On the Enthusiast side, I think the averages are similar, but still lean towards motorcyclists being more passionate, with the main example being the % of motorcyclists having custom exhausts and levers. I'd estimate at least 25% of motorcycles have those features. For cars, I'd estimate 5-10% would have custom exhaust or steering wheels.
I don't think there's any evidence to suggest passionate motorcyclists are dramatically more passionate than car guys. Lots of car guys have their entire identity tied up in their choice of car and bury themselves financially to drive that car and are pretty much obsessed with it.