I have re-published my first novel Lute of the Sparrow on Amazon and CreateSpace. I disabled it a while back because … well, I don’t actually remember why. Possibly because I thought it might hurt my “career” as an author (such as it is). Perhaps I thought that if I ever did submit that novel to a publisher, they might Google it, find it on Amazon, see that only four people have read it, and drop my manuscript in the trash. However the odds of me submitting that manuscript to a publisher without significant alterations is pretty slim.
In case you are wondering, no I don’t make any money from those, and no I would not recommend self-publishing unless you 1) hire someone to paint a cover for you and 2) super-dedicate yourself to obnoxious self-promotion 24/7. So don’t quit your day job. :)