The story of special exemptions for very useful Jews or in one case a good friend of Hitler -- these exemptions resulted in people like Milch being able to serve at a very high level in Nazi Germany and again in Milch's case, even be tried for war crimes. What I am wondering is, do we have any indications of what Milch et. al. expected once the war was over? Were they treated just like other non-Jews once exemptions were granted? Were they sometimes able to save Jewish relatives or did they studiously avoid doing anything that would adversely affect their Aryan status?
Regarding Milch, his mother declared that his biological father was another man, an Aryan, so he would be treated as Aryan.
In other cases when "honorary Aryan" certificates were issued, they had a provision that the certificate would be reconsidered after the war is over, so all the "honorary Aryans" were to undergo one more selection after the war, possibly, based on their performance during the war.
Like all things political, you can get just about anything if you're well connected or very wealthy.
In the case of nazi Germany, the key was a document called an Aryan Certificate, which was your 'get out of concentration camps free' card. A few very well connected Jews were able to get these, including Milch. With that certificate, they were no longer Jews, but proper Aryans.