I'm not quite sure if this already exists or not as I wouldn't know how to check it in order to find out anyway.

But my suggestion would be to make blacklisting a person add their entire account into blacklist. It seems silly to add some gold seller jerk in there only to have that same one create a new level 1 character to message spam again. Now times this by 500 and the potential private messages and capitol city spam is impossible to get rid of.

I'm sure most people like me use blacklist 90% of the time for gold sellers.
Alternatively, keep blacklist the same as it is now for standard bad eggs and add a new account block feature specifically for gold sellers. They in turn, could use people's account block lists as a tool to track down gold sellers, if say, it meets a certain criteria of at least 20 blocks on a specific account they could take a closer look. But that's just icing the cake. I just really want the cake, with or without frosting.

Thanks for reading.