Two unrelated thoughts.
1: One tradition comes from the halls of science. The other comes from the halls of business. One is logical and consistent. The other is ad hoc & inconsistent. I leave it to your knowledge of human nature to decide which is which.
2: In times gone by folks developed different symbols syntaxes to differentiate stuff they were copying by hand. They didn’t have too many different syntaxes available, but that was fine because they didn’t have too many categories of things to write.
Fast forward to today with the explosion in categories, measurement systems, nomenclatures, etc. Against that combinatorial explosion of complexity we now find consistency to be a virtue, not a source of possible ambiguity. Common syntax also helps lots when the intended audience is often a relatively inflexible machine.
Yeah, but in Quebec specifically, they use dollars and commonly put the symbol after the number. So one can’t even make the counterargument that dollar signs (as compared to euros, etc.) always go in front. The OP’s usage would be perfectly cromulent there.