Okay, lets face it, we are stuck with this turkey, a trait that gains you less gold than traits that refuse repair costs, a trait that at present does pretty much zip other than clog up loot tables. So how about this.
Change prosperous to have an effect as follows. Each set you use can have the required number of pieces reduced by one as long as one of them is prosperous. No more, no less. So if you had three sets you could get three discounts. At the same time you change the way that max stats effects weapon and spell damage so that you end up with the same bonus you get now but instead of if being calculated off your highest stat it would be your pool as a whole.
If nothing else it would kick open the door to a whole world of builds. This meathod worked in other games, why not here?