I guess there must be a word and/or sentence limit for your post to be deemed 'worthwhile'.
I think it's a good idea that this limit is in place. Most people may not be spammers but the amount of forums I see out there that are overrun with SPAM comments really bring down the quality of a potentially decent forum.
This forum seems like a good quality one, and (as a newbie), more than happy to abide by the restrictions and wait before I can post.
(although it did take me a while to find this board and work out why I couldn't post)