Part of the reason not doing it is the technical difficulty (as I'm not a HTML person). I'll have to take a look at Jack's method. It looks a bit different than how Vern did, and that's also not the same as Bob Spirko's site. I'll have to do some research and decide. I certainly wouldn't host the files on my own site as I do have a very limited storage space.
I can see that sharing GPS track is becoming more and more popular as we shift into the paradigm of Internet age.. I myself came from a background of hiking and sight-seeing so by heart I always do as much research as possible before heading out. My first scramble was a mere 4 years ago so I came right into the "internet age", without experiencing the "old days", so I don't have fundamental issues with sharing GPS tracks, although Dru and Alastair might have other thoughts. In general there are "explorers" who like to tackle the unknowns and there're "hikers/scramblers" who always tend to follow a more instructed route. There's no right or wrong. Right now the opinion might be 50/50 (as far as I can tell from my friends), but in another decade I can see a trend that more and more people will be sharing everything online.
As for now I do get a "GPS require" email for once in a while and I always give out my file (as long as the tracks are obtained from my own device). If it's from Ben or Vern or whoever then I can't give out.. (A lot of trips we only carry 1 GPS per group to save weight so not all tracks are from myself). However, even without a GPS track, you can always draw a line on scribblemaps.com and I found that's exceptionally useful for finding a logging road or a trail-head (you no longer need to count your odometers but rather keeping your eye on your GPS screen).