I don't really see the point in this. Developing a better flagging system and instilling the need to stay vigilant to the users should deal with spam. People need to learn not to add to a pile of spam and not to feed trolls.
As for a word limit, it can easily be bypassed. I'm fine with a character limit. Sure it can be bypassed but its job is to deter, not to prevent.
Some people are saying that it would be easier to spot a chunk of spam if it was only a single word, compared to the same word repeated over and over again. I believe we aren't blind at all and that we can actually read what's on the screen, so really I don't care much. Spam is spam.
I see how people could do that but then they would have a bad reputation for spamming don't you think?
The people who pointlessly spam on a regular basis don't care about reputation. They're either ignorant, foolish, apathetic or bored.
But then people/mods would be reluctant to delete/ban people with thousands of AP, wasting hard work.
People ought to be punished according to the offences they make. Though I do agree that manual detection is the key.