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.
And trying to chisel a 75% discount out of everyone you buy from is?
Whatever society it is that you're talking about isn't for me, I guess. Sounds like a lot of work.