I don't mind people from my own World occasionally advertising their things, as long as it isn't multiple characters spamming it way too often.

What I despise is people from other Worlds or Data Centers coming in to drop their spammy macro and teleporting to next destination like some bot.

Similarly, seeing multiple repeat ads in Party Finder is annoying spam, just put your one up and be done with it.

At least the people out themselves doing all this, makes it easy to blacklist them, but problem is eventually running out of list space.