A ten-minute piece on Motivation, by Dan Pink, author of Drive (with… - Zer Netmouse — LiveJournal
Interesting! For me, I'd guess a bit more than now, say $150K per year. That would recompense me for the extra hours beyond my contracted time that I think necessary to do certain aspects of my job to the standard that I'd like.
Of course, I no longer have a mortgage around my neck and live in a country where healthcare is 'free', but gas costs around $8 per gallon.
Another aspect is relative age, I'd think - close to retirement and you'd need to focus on maximising income - almost to the exclusion of all else - to provide for retirement. Earlier in life and you can 'afford' (both financially and in available time' to view things differently.