I was checking out a Youtube interview with Robert Cray within the past couple of days and he was saying that because he uses so much vibrato, he has to get his guitars refretted every six month or less. I obviously don't play as much as Robert Cray and I don't use same guitar all the time when I do, but I use a lot of vibrato myself (hell, it's about my only trick that's any good at all) and yet I seem to be really easy on frets. I had a strat for 30 years (only 10 of which I was playing it a LOT - the other 20 waaaay less) and never had to touch the frets. I'd never really thought of vibrato as a fret killer, but it makes sense it would be...