Greg Covington and Fred Rowe pretty much got it for me. I've been a knife user, carrier since I was a kid. In Jr. High, I took a metal shop class and the teacher made custome hunters in his spare time. I thought that was too cool. As I progressed through school, I really focused on metal working and eventually went to work as a machinist. I got stuck in a production environment and eventually left the trade by age 21, but always thought that one day, when I retired, I'd build a shop and make some knives.
Fast forward to being 40. At that point, I'd learned a bit about mortality. It's not guatanteed that you will make it to retirement age. If you do, your eyes and co-ordiantion probably won't be any better. I'd also spent two decades in a sales position in the consumer electronics industry where there was no satisfaction for a job well done, just the pursuit of the next sale or purchase order.
I decided that it was time to pursue my life long dream and make some knives. Part of my motivation was to have a creative outlet where I could produce a project, no matter how badly, that had a beginning, a middle and an end (never happens in the sales channel). The other part is that I've come to grips with the idea that I won't last forever, so like Greg alluded to, I'd like to leave a legacy. To make some cool knives that might well survive long after I'm gone and cause someone to wonder, who was John MacDonald? Why did he make knives, and why did he make them this way? I have no illusions of becoming teh next Michael Price, or Bob Loveless, but want to make some stuff anyway.
I don't have kids of my own (do have a step son) so the knives I'm attempting to make are my only legacy to society. Nobody will remember what a great sales rep I was, but perhaps someone will cherish a knife I made enough to inbue it with enough specialness to pass it down to their heirs.
My time in my shop is theraputic on many levels and hopefully one day I'll make something worth talking about.