This is common among posters of the forum. People hardly follow their post. I'm inclusive in this and this isn't a nice idea. Post is to teach people and for the poster also to learn. Not following one post may not pass good meaning to the viewers. Let's try to follow up our post so that if questions arise from this post, one can easily answer them.
I don't think is really bad not to follow your post, the bad thing is not following it up incase you're being quoted, you might have something to contribute, the thing is you sometimes don't find the time to go back and check on your post if there is any error.
And to me following up post only have to happen if someone quote your reply, but if you're going back to correct any error then it won't be valid. If you edit it and you've been quoted the error can't go off, is best to correct it before posting.
