Your target market is middle aged men looking to recapture some of the glory from their youth... and if your theme song from that period was GNR, and you are middle aged, well then JJP is probably hitting the sweet spot of their target market. I have been surprised by the performance of the retreads... i.e. JP and TMNT, so I guess a GNR retread might work as well. If I was picking a group who is relevant to my target market, it would be a toss up between GNR and U2, or Aerosmith, and well Stern already did that didn't they? Hmmmm... U2 you say? I bet Bono would do it if you donated all the profits to the rain forest preservation society...