Jeff - the upgrading of the forum software in and of itself would not necessarily increase memory/space for photo posting - that would depend upon the settings the admin allows for photos to be uploaded to the site's servers.
That being said, it is possible that updated forum software might allow for more functionality as far as how big of an individual file (photo, attachment, whatever) can be uploaded at one time
- but again it depends on what the server file size limit is (as set by either the admin or the web hosting company restrictions.)
I can surmise that the site may have restrictions in order to prevent their server space from being filled past capacity with fan photo uploads. (Because, beleive me, when you have a website, nothing sucks more than running out of server space!)