When people are looking at cheaper oils of any kind, they are concerned about price. THAT is why they are looking at cheaper oils.
What really needs to be looked at is to find BETTER oils. BETTER oils are not always the cheapest to buy.
I'll gladly pay a few $$ more for a BETTER oil than the hundreds or thousands $$$$ more it will cost me on new clutches, bearings or transmission components wrecked by using cheaper oils.