I once enquired out of curiousity via Axl Rose's office about getting him to do a personal performance at a wedding. I actually got a reply, saying his fee would be a "non-refundable deposit of $5million". Which of course would be money down the toilet, but well if I had £148m, I would definitely pay it, just in case he did show.
Now though I would rather pay Slash and his band twice that for a personal performance. They play the guns songs far better than Axl's tribute band ever could.