Here is the full link.
My opinion is that it really isn't that big of a modification to add three players to the event. Yes, you cost people $500 in equity. That isn't chump change, but its not grand larceny either. When I first started reading the blog entry, I figured they cancelled the tournament. DN's sense of outrage was totally over the top.
Obviously, this is just amateur psychoanalysis, but it seems possible that Daniel's take may have something to do with not being added himself.