If you fall and rotate, you get less than for a good double axel. That pretty much is where the problem lies. It's not worth the risk.
A 3A for a lady is much, much bigger a deal as well as more rare than a quad for a man, yet the reward is smaller.
Balancing should be done for the top levels. The lower end skaters will make do with what they get.
3A 8.50 - 3.00 is 5.50 - 1.00 (fall) = 4.50. Which is more than a good double axel. Unless you are looking at the effect on PCS, which may or may not happen depending on who it is. In any case, I think it is unlikely ISU will implement different values for the same element. All technical elements have the same value for singles disciplines.