Part of my reason is similar to Rod. My feet, back and bum shoulder don't like to carry 8-10 lbs. of gun up and down the hill.
I think the challenge part has a great deal to do with it also. My biggest problem now is just getting started!!
Finally got our house sold and the weather is warming, so I should be able to get out there and pick a revolver and get to it. NO MORE EXCUSES, HUH?!