I see your point Drey. However, I am winning to bet that trading will also make people with powerful mains get more powerful since you would have to spend gems or money to buy more gems to trade others. I am not sure people with a lot of alts would want to spend all the money on alt accounts. If the mains get stronger, maybe alts won't make as much of an impact.

People who invest in their main account would most likely be the people who spend gems to trade from other players of anything that is of high value. I can see the low level stuff being sold to alts.

I just think that by having trading it would give people more choices and control as well as more fun.