How is this any different than requesting a blowjob in the parking lot to every woman you encounter in the gym or grocery store? Occasionally your insulting offer will work. It will work a very small percentage of the time, and meanwhile, you gain a reputation as an annoying douchebag that will follow you around 100% of the time.

I'd rather just take or leave the deal at the asking price, or something reasonably close to it, and get on with my day.