I lost the stator on my son's sled, a few years ago, and we were about 3 miles off the beaten path. We only had to get out of the hole we had just dropped into and then it would basicly be downhill from there to the groomed trail. The pull up out of that hole was about 600 feet and there was about 2 foot of powder. Not good. We rounded up a continuous handwinch(come-a-long)with about 200 feet of rope. Once we got everything rounded up and rigged up, it took about 2 hours of cranking that hand winch and we had it to the top of the bowl. My arms still ache thinking about it. The motorized winch would have been a definate improvement, to say the least. Not everyone has a hand winch like that one with a good length of rope, let alone a motorized one. As for pricing, you might compare with what a rental shop would charge for one. You have a great idea and had I known you were close I might have called you. Maybe I just need to find out where you got yours. On another trip, I lost a chaincase and was into the back country about 8 miles. I took in a new chaincase on that one.
Good-Luck!!