I think we all get annoyed with door to door salesmen and telemarketers. Maybe their professions are annoying, but it is their profession. As long as people continue to make money going door to door or making cold call sales, it will continue to go on.
I also think Realtors make too much for easy transactions, but as long as there are people who waste realtor’s time and resouces, a 6% commision will remain the norm.
The art of advertising is to get you to remember the stupid sign.