Iv never really had a problume with handing DE money. Most stuff is cosmetic or rush times anyhow.
The best way to make plat is selling off prime stuff and hard ish to find mods. Or, if you can stand it, any of the aberations stuff (becasue f*&^ aberations). Part of the reson I do not do this however is because of plat scams that are more likely the higher price an item is, and it can get your account banned for someone eles doing something wrong.
This is both a buyers and sellers friend. If your selling however, you have to stick to the price you put up, and its somewhat determined based on the lowest price listed. you can go into trade chat and try to get infalted costs, but at the very least use this to know how much things are worth.