If you report them because you suspect them of RMT, they will start an investigation which will include checking server side chat logs, /tells from GMs (STF will tell them to do it) and checking if they obsessivly sell things that could look suspicious.

If they can get proof the players are botting they can ban them, but because they dont ban without evidence this procedure is neccecerry, and if the RMT are smart they will cover thier tracks, mainly by not afk botting.