Bill; that is a very good way of doing things. It's much the same as I operate; but I offer a fair price that I want to pay to begin with, and then on arrival; top it up by 20 per cent. They are almost always pleasantly surprised and offer "Respect". That way, they are eager to carry us in the future.
I had one bad experience in January. I thought I could trust the man and we got in without setting a price. He demanded too too much on arrival at our hotel from the taxi park, and I told him I will remember him in the future. But; ultimately; my fault for not setting the price to begin with. I was just to used too being treated well by many other taxi men.