The question then becomes what can/did BC offer that Ontario cannot.
lower real estate costs once out of the Van / Delta area, much lower energy costs, lower business taxation rate, no carbon tax grab, easier to deal with permiting and annual inspection, cheaper insurance, and the icing on the cake, you go to the municipality where you are about to create 30-50-100? new jobs and say we can do this but we want incentives like no municipal tax for 5-7-9? years and you get the deal, that tax savings alone can finance the move.
The whole cheaper wages in Mexico is just a small part, there is a whole bunch more cash to be had relocating.