American's have money

I've pretty much got used to people staring at me or randomly yelling out "Hello!" as I walk by.  But one thing I'll never get used to is people telling me I have money or asking me how much money I make.  The usual conversation goes something like this "你是哪国人？"(What country are you from?) "我是美国人。"(I'm American）"噢，美国人有钱。“ (Oh, Americans have money)  I'll usually try to tell them not every American has money but they don't believe me.  If they don't outright state that American's have money they will ask me what I do for work and then ask me how much money I make per hour.  I usually just go ahead and tell them how much I charge for one hour of teaching.  One day a guy then told me how much that should come to every month.  I then had to explain my work schedule and why his estimate was wrong.  I thought, why do I have to explain all this to strangers?  That same day I was trying to buy a pretty silk scarf from a guy with a cart on the street.  We started to have this same conversation but when he asked me how much money I make per hour I just smiled and said “我不会告诉你” (I'm not going to tell you)  He laughed.  Then his wife walked up and told him I should buy two scarves.