Let's say, each 250FG you spend increases your inbox size by 5 permanently(Up to a max of a certain number if desired)

It would help out both the site, and make FG have even more value, as well as allow users to increase their inbox size.

I.E.

22/55 Unread messages with one purchase.

22/60 Unread messages with two purchases.

It would stop threads like this from happening: http://forums.d2jsp.org/topic.php?t=56512836

Why is the PM box a limited size anyway?

This post was edited by GhostBeeToast on Jul 22 2011 06:57pm

This has been suggested many times and denied each time it was suggested
I won't be surprised if this is closed without a moderator even commenting on the fact that this has been posted numerous times.
I do applaud you for your effort and do agree with the idea, but I don't see it happening.

no, should be unlimited anyway.
should delete old messages after a month or so, and keep the ones you left 'checked'