All F2P online MMOs which don't require downloads, and while you can use cash to get ahead in them, really don't require it. Cash is usually used to unlock special extra (like classes, inventory slots, etc) but you don't *need* to play the game.
So how bout we say start an extension for your chars so that each char can hold 20 of each weapon/armor but all you need to do is pay an <example amount> to add the extension? That would be quite easy to implement should be just a few number changes in code and could even be automatic like supporter payments.
I know many of us would love to have this little addition I for one am all for it ^_^
