Supposedly, a post will degenerate over time, especially if it is edited over and over.
I can believe that, sure, and have purposely kept the 'degeneration' in mind.
Today I noticed a post I hadn't edited degenerate, though. I moved the post, so it was okay. But it was scary that a post I had not touched was suddenly found to have degenerated into a post that killed all the spacing.
If you click my username, see my posts, click 'topics created,' then click the post between "Unto Caeser" and "Coywolf," you'll notice that this post in its entirety is posted there, but without any spaces. Imagine if the post was a page or two instead, and there were no spaces.