on the topic of old guitars sounding better than new ones, i sort of agree.
Matthias Jabs talked about this once in a guitar mag: he had a new guitar which he felt needed "waking up," so he had his techs keep it onstage at every show, on a stand, pretty much beside his speaker cabs, and this exposed the guitar to musical vibrations similar to actually being played. I'm not sure how effective it actually is, but it's kind of plausible.