I think most folks who buy an air cooled 911 (60's-80's) are buying their dream car/time machine. Some of them will have expectations that cannot be met regarding performance and overall liveability. Those owners will turn the car within 5 years and move on to something more current in the manner that HardDrive describes above. It's kind of a bummer when you idolize the 911 for so long and then once you get one realize that it's just a tick faster than some the newest mini-vans you find clustered out front of the local elementry school.
My mistake was using my '86 as a daily driver which was 70 miles RT each day on the I-15. With a black exterior and barely there AC the summer months were uncomfortable. Stop and go traffic was no fun. No cup holders... What I should have done was keep a cheap commuter car handy, or bought my motorcycle at the same time, to break up the commuting duties. Now I'm lucky to be able to work from home and pick the hours I choose to commute (late in - early out
). I'm spinning a plan to get another 80's 911 into the garage sometime in 2008.