Meh, welcome to the monkey house...
I think they have done a pretty good job ensuring that mods do not break the game. And they should know that there is no way to make it exactly even. I have really bad hand eye coordination. So, I favor mods that help me overcome that. Conversely, I do not need huge health bars occupying a lot of screen realestate to tell me the "score"
In addition, when we a quick market analasys is done the best mods are going to be the cheap ones. THis is all about WalMart volume of large numbers. Not, a mouse hardware model. If the average modder released a mod, that 10% of the player downloaded for a buck, the modder could friggin retire if they maintained the average gammer cost of living.
Not to mention, that there is no IP in the mods, so whatever works will be copied and charged less for.
No use preaching to the choir
Rham