I dont mind them. They are easy enough to get that a typical player shouldnt feel hampered in world chat communication, and it prevents certain scenarios as mentioned before (i.e multi troll spam) from spoiling the experience for people looking to have a decent conversation/thread going on.

Its not abnormal to have such a system, for games without a "trumpet" solution, there generally is some sort of level cap before a new player can start broadcasting speech to everyone. Better to have a system in place to discourage spammers, and I really dont see how the trumpet system would hinder any account thats more than a month old. The most useful trumpets would be is in the initial stages when a player is hunting for a good group, but generally someone would "advertise" for groups and you c*ways use the messaging system to further the conversation.