As everyone knows, the main channel that everyone uses is General Chat. However, I think we need additional, more specialized chat channels. For example, one for advertising and joining Towns, another for asking for help, and another for trading, selling, and buying items. This would greatly help the server as people would be more able to see things in general chat, and get the things they need done quicker.

General chat, when there's a lot of people online, gets flooded every minute with people asking for help, which makes it very difficult to talk to other people unless they're nearby. If there's additional chat channels for different things, it'll lessen the amount of chatlogs coming into the general chat, and maybe even alleviate some lag on the server.

I believe there is already a reply to a very similar idea, and that reply amounted to "The chat system is already highly complicated, adding more complexity to it would just lag the server more than the gains".

My personal view and suggestion, most of the issues you are giving about the content of general chat would be alleviated by more patience. Patience that something doesn't NEED to be bought/sold RIGHT NOW, patience that answers to questions can wait is they aren't breaking your game (being inconvenienced is not breaking your game), patience that posts on the forums are just as useful if not more so than using the in game chat because it doesn't flood the channel with things that can indeed wait.

I know that's a hard thing to do, especially considering how young many players are, but it's the best solution to work with the limitations available for solutions.