That is one reason to park domains. But, also as Dave says, it is a great way to track your advertising. You can advertise "abc.com" one way and "def.com" another way, and see which is most effective at getting traffic. Alternate spellings is another good reasons. If people commonly misspell a word that is in your domain name, buy the alternate spelling - that way they can still find you. Like "bestfriends.com" and "bestfreinds.com"
