If you WANT a service level agreement with me, then you may contract for one. If you pay me enough, I will guarantee you updates on what ever schedule you are willing to pay for. I will be very professional in my dealings with you in that case too.
When you want something that is provided for free, and when you want to treat me like you are paying me a million dollars a year to give it to you, guess what ...
You can also get service level agreements from Red Hat or from Oracle or Novell.
Politeness costs nothing, though, doesn't it?