The thing I don't understand about retention pay, is who cares, lots of people want these jobs. I don't mind paying cops fairly well, but I think it has little to do with corruption. If you paid them 65K top scale it would be fine, plus perhaps a premium for cost of living in Toronto.
Lots may want them, because they are supposedly 'sweet', but how many succeed in becoming officers. A whole lot less than the number of who apply.