License plate cost (sticker) for pickup in Ontario...

Just another government money grab. Curious though, if trucks are all considered commercial vehicles and those over certain weights need the commercial stickers and inspections even for personal use, are they required to pull into the weigh scales when the lights are flashing? I had read no, only if it was for commercial use. Seems like a double standard. Register it commercial to pay the higher fees but don't need to follow the commercial regulations?