I can't speak to the profitability, but in Ottawa you get the stuff bureaucrats. They pay. But you compete with the QC girls who have serious game.
In TO you compete with way more people. You can make crazy money but differentiating yourself from the crowd will be difficult.
If you book up in Kingston/Belleville I wouldn't bother going any where else.
I've dabbled in most large Canadian cities. Kingston rates are competitive for an SP. why spend the travel money?