Can they? Recall that we're just talking 3rd-party liability in those costs. Just one badly injured person would bankrupt many average riders, never mind a car or van-load of them.Really? Most supersports riders here can cover all those expenses you wrote up with what they pay for their current insurance premiums and still come up with a profit, and you expect all of them to crash right? I'll take $40,000 coverage for insurance at $65/month on an R6 anytime of the day.
And don't forget that in Ontario your mandatory coverages also include your own extended medical care, rehab and income replacement benefits. That's usually over half the cost of your motorcycle insurance premium here, and is available only at big extra cost down south. That's right, have you looked into the cost of personal accident medical insurance down in the US? You're looking at $$$$ thousands of dollars per year for an individual. Add that cost to the cost of "cheap" liability insurance in some states and you're looking at paying about the same or more as you do here.