Good article, makes us a whole lot more aware and be responsible hobbyist. We should make this a sticky thread.
The main idea behind this article is basically doing your research before any purchase. Do i know what is this? Can i provide for it? If in doubt or you can't provide for it, don't buy.
Here's a good article from reefkeeping regarding starfish:
http://reefkeeping.com/issues/2004-0...ture/index.htm