This somewhat ugly PSA/DNA cut of the icon Sir Mick Jagger sold for $745. It shows up as having sold for $799.99, but the Best Offer Accepted price was $745.
I have consistently been seeing simple cut autographs of Mick Jagger and Paul McCartney sell on eBay in the neighborhood of $800. So their autographs on pretty much anything else should only be worth more.
Anyway, here's the link if anyone is interested, and there's a pic below.
http://www.ebay.com/itm/MICK-JAGGER-THE-ROLLING-STONES-AUTHENTIC-SI...