I think the average pay has been affected by market saturation. There's an endless supply of women who need money to get through school and pay rent. Many sugar babies use multiple sugar daddies so there's no need to pay them so much money anymore.
Personally I would only use a sugar baby is the girl was extraordinarily good looking like:
WorldStarCandy | WorldStarHipHop
Also, you don't need to be filthy rich to have a sugar baby.
I had a friend who was a bus driver and had this Dominican dime piece on his payroll. His wife was even okay with it (yeah my brain still can't process that). The 3 of them would go on a cruise and take trips to Europe.