The reason Prince gave it away for free was because he had released it for free previously anyway.
What I think Michael should do is partner with a website such as Concert Live (
www.concertlive.co.uk). They record concerts and allow fans to buy them the same night. I have used them before and the CDs are always a best seller!! Basically, you reserve your album when you first arrive at the venue and get a slip in order for you to collect your album at the end. After the concert, you go back to the stand you bought the album from when you first arrived and, within 15mins of the show finishing, you have a CD contaning the concert you have just attended. It's normally a 2CD set and they're great value for money (£15, I think). If you can't hang around after the show, you can get the CD sent to you in the mail just a few days later. Each CD is limited to 1000-5000 copies depending on the size of the show so they, in effect, become collector's items. The sound is always top-class and you normally recieve something extra with the CD (for example, with the Franz Ferdinand one I bought recently, you got a download of a concert they recently did in Vienna for free. With a We Are Scientists one I bought, it was a download of their new single).
I think that, if MJ did this, they would sell brilliantly and, as each night's CD would be slightly different, people who are attending the show more than once may buy again.
What d'ya reckon?