I always come back to the fact that the vast majority of the audience for any gig won't be musicians, and would be hard pressed to tell you the difference between a Strat and a Les Paul, let alone being able to hear the tonal difference between a stock Epiphone humbucker and the fancy new Seymour Duncan you installed... Anyone who can actually hear the difference will inevitably be standing grumpily commenting about how their own rig sounds far better anyway As for what is worth it, I would have to agree with the previous comments on the amp being a far bigger part of the tone than the guitar - The amp (and indeed pedals) has far more power over the signal and how it is processed, so will have much more of a bearing on the end result than the guitar. A cheap guitar through a great amp is always going to sound better than a great guitar through a cheap amp (though obviously neither will sound quite as good as a great guitar through a great amp). The fact is though that while the amp may have more of an effect on the 'sound' you have, the guitar is your physical contact to the music, so how it feels in hand will have far more of an emotional response and change the way you approach and play music. So that high end LP may be lost on most of the audience and nowhere living up its potential through a wee amp, but if the guy playing it thinks it feels and sounds better, then his playing will be better than when playing the naff strat knockoff that you have to fight to play well and are always questioning whether it has slipped out of tune yet again.