@RedRider,
I think a lot of it depends on if you were a runner before. In my case, even in high school and college, I ran for a different purpose. I played Basketball, and flew up and down the Basketball courts. I did shot put and discus, and ran sprint drills through stadium stands w 50 lb. weight vests.
I never have been a long distance runner, nor have I experienced that "runner's high" that so many speak of. My goal is to walk/jog the Houston marathon in under 4 hours. Most runners would look at that and say, "Oh my goodness, what's the use?"
I have decided that if my foot will cooperate, the use will be the sense of accomplishment of doing what I have never done before. I may not experience a runners high, but I will feel great when I cross the finish line!
I can tell you, I have been training for 10 weeks, and even walking is taking a toll on my body. I have not reached my goal weight yet though, so that is part of it.
So, my point is, do you really have to run to experience satisfaction of doing your best and keeping your implant happy?
Dick Beardsly runs marathons all the time on 2 replaced knees. He also has to have the replacements replaced. Worth it? Not to me.