Blocking low levels is not the answer. It sounds really tempting, but it's not a good idea. So for example, i was running around Uldah and a new player /tell me to ask me where a certain spot was in the city because I was standing near them. I showed them, they said thanks, and left. Interactions like this would be blocked if we blocked low levels. I wasn't going to add the player to my friends list to talk to them, or how would i even know if they wanted to talk to me in the first place?

We can't be antisocial just because of RMT. RMT would just bot to 15 or 20 or whatever level and continue to spam. We would only be harming new players. I suggest doing what i did for now...i have a macro that just blacklists the last person to tell me. I stuck it on my hotbar and anytime a RMT /tells me, one click and done. The only thing I could see to fix it would be making the reporting easier somehow and make sure that the GMs respond in a timely manner to get rid of them.