And how many times in Ontario, do you see vehicles in rush hour with every seat occupied? It's rare to see more than one person in a vehicle, and if there is, then typically it is 2-3 (with 3 being typically 2 parents and a child).
If the HOV/HOT lanes are here to stay, then I think they should let us (motorcycles) in it, and leave it up to us to choose if we want to use them or not. Honestly I feel safer in one of the outside lanes, so if traffic is flowing I'd prefer the HOV, but if there is a big disparity between HOV and normal lanes, then I'd probably stay out of the HOV lanes vs risk someone making an abrupt lane change into me.
Also, if we do only account for 3% of registered vehicles, and most of us don't ride daily (as we have a car or transit to work), and the fact that we really only ride 1/2 to 3/4 of the year, any negative impact to the HOV lanes in terms of added vehicles would be negligible. It would also make things less confusing when we have differing rules between the DVP and Gardiner and the 400 series, although in doing that, they'd probably lower tickets and therefore lower their revenue stream.