It would add a little additional work onto moderators who already do a superb job in keeping members safe from spam/inappropriate material. As such it might impact on the amount of help/guidance they are able to provide, in particular to newer members. Most members are experienced enough however and more than willing to help self-moderate the forums and are quick to report inappropriate material, so I cannot see a major issue from a moderator point of view.
Whilst a nice suggestion and one I would happily support, the PokerStrategy team are currently working on great content for us, educational material, coaching, software developments, improvements to the forum etc. It depends what you feel is more important at the moment, it would be a shame to lose out on some content at the expense of a visual aid.
I think it was for this reason that the same proposal a few months ago was declined (for the time being). Never say never though, developments in this area may be possible in future.
Nice suggestion, keep them coming.
Best regards,
Bart