I'm not sure how this works, if it has already been discussed, or if this could be under the convenience tab but here goes nothing.

I'd like to propose this:

When getting a pm(private message) it is very important to check constantly, especially if you're running a business like studding for example or breeding with several partners. But what if your inbox is at 199/200? What if you are supposed to be getting a few messages from your business partners? Then what? The uncertainty, and the inconvenience is why I propose a 300 or 400 message capacity instead of at 200. Yes there are a lot nicer things to worry about like new mutations and markings, but think of how much more businesses or even roleplays you can have with a bigger message capacity.