Oh noes 1% of the population will sell clears to 3% of the population. Clearly worrying about less than 5% of the population is a reason to not implement something that will be of great benefit to the other 95%. Merc runs have been in every game ever, and will remain. Stop worrying about it if you aren't involved in it (or are you jealous that there are players who can profit off of their skill?).

Again, why worry about other people making profit if it means you can't play with your friends? Or would you cut off your own nose to spite your face?