Yeah I can chime in on this one as well - Jonathan replaced my Baja's frets a while back.
Same as you Ian, it was "how can I justify this on just the neck??!", but since having it done I'm looking at my other guitars with a view to fret work of some sort and the GAS for new guitars has somewhat diminished for the moment (that's the "planned GAS", mind you, I still don't rule out the impulse buys if the right thing appears in front of me when there's enough money in the pot!! :lol:).
I'm sure I could do frets myself, BUT what it would cost me in tools, practice time (and b*ggered necks/fingerboards!) kind of rules it out for me. One of the things I've learnt this year is that worn frets are not the end of the world - they can be fixed/replaced. It is a pricey job (whether you pay someone else or decide to take it on yourself), but boy does it make a difference when they're done well... It's like you've got a new guitar in your hands, but it's still your old favourite at the same time.