Look at Prince, i went to a few shows on his 21 night residency last summer, and although it was billed as 'the last time he will play his greatest hits' each show's set was different, with rare gems and medleys thrown in everywhere.
With him you get the feeling that no song is protected, any song can be replaced.
It makes it all the more exciting for the punter, and with the amount of material that Bon Jovi have they really have no excuse for not expanding thier options a bit more.
I mean c'mon, Prayer, Bad Name, Its My Life, & Wanted are surely the only tracks that NEED to be played, that leaves 14-20-ish songs to play around with.
I wish they would respect the long-term fans and mix it up a bit (never going to happen).