He did something very similar in 2004 at Christie's - some of his own guitars, plus a few donated by other guitarists.
I didn't go, but I did buy the catalogue - lovely pictures! There are some surprising things you wouldn't expect EC to own, like a Terry C McInturff guitar, a Gibson ES-336, an aluminium-bodied Strat and a Tele with a neck humbucker. All gifts to him, of course.
Maby he'll flog that godawful gold leaf one?
*vomits a little*
That was sold in '04 (unless no-one wanted it!)