Also, the more expensive the product is, the fewer the number of people who will buy it. With a $40 commission, that is probably an expensive item.
I have some banner ads that were clicked over 1000 times with zero sales. Very few breathing people click on banner ads today.
Today if I get any commissions at all the ad is successful.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin