Why is there so much RMT spam?

[Seif]

Change that to:
-Click -> Report as RMT option that blacklists the account used.

It'd be much better to have them work on an option that actually combats the issue instead of sweeping it away somewhere so it's just not seen.

This. All other suggested disclaimers wouldn't have any effect at all. Do you really think RMT will be like "Gee they don't want gold sellers in this game? Okay then!" How naive.