Sales guy came to my door today. He was polite but...

Sales guy came to my door today. He was polite but it quickly became clear he was trying to scam his way into a new account. He insisted he see my hydro bill and that he is bound by "government protocol" to see if I qualify for savings. I asked him to leave some literature so I can read and guess what, he "didn't have any". SCAM. I suspect he'll be back to key my car. A polite scammer is still a scammer. Why are they still in business?