I received my first one a couple days ago. I'm usually in a party with FC mates when I play, so this hasn't been too big of an issue. However, I can't always hide away in a party, and shouldn't have to.

I really think adding filters to restricted named would help. Since they seem to be using their websites as one part, start with restricting names with any sort of RMT website included in it (the one I got was from pvpbank or whoever). They also literally had "wtsgil" in their name too, so restrict that string, as well as any variants with special characters.

You can't really "take one for the team" as one poster suggested, because, at least in my case, the RMT bot sent the party invite, and it literally disappeared a second later. So unless you have godly reflexes, it didn't even give you time to accept or not, just enough time to see the name/advertisement. Plus, they could always just disband the party. I'm sure there's a way for even bots to do that.

I just reported the bot under cheating (since it was still RMT advertising, even if it can be considered harassment). That was about a week ago, and I haven't received any more unwelcome party invites. I really like the idea of auto-ignoring party/FC invites and trade requests. Without having to put yourself on Busy.