I used to have 1728 ( not that it tells me anything useful )...but now I am unrated !!! I like it but my opponents may not...but I wish chess.com explains why.
Why do some people's rating says unrated?

read this:
Finally, for unrated players we’ve replaced the default “1200” in most contexts with the term “unrated,” which is easier to understand for many new users. (This is just a change in presentation; ratings calculations for unrated players still use 1200.)
From artical:
http://blog.chess.com/webmaster/site-enhancements---20110616
Why do some people's rating say unrated??