Let's face it, RMT know they will be banned eventually, that is why they make characters in masses then wait till their batch is banned and then bring the other batch after, This is the same problem that was in early days of FFXI.

Eventually some people get tired of blacklisting and reporting them, so they stop bothering, which in the end RMT plans are working, to annoy you as much as possible and get poor fools who are stupid enough to buy their gold. or use whatever dumb services they have for very lazy players.

I blacklist them, and then HOURS later after reporting, they are STILL their spamming. and when they are hammerd, they bring out a replacement, this just keeps going on and on. this is how they work.

In other words SE needs a faster way of dealing with them, and because they know that character will be there a while. so they are very aggressive with the spam.