I would use this for appliances. Repair info, sources for parts, maybe videos. Is the “buy it for life” community mostly for smaller purchases?
Would the site be more useful if it had a "product page" where it showed how many users have bought the product, avg life expectancy, etc + the repair guides and reviews?
Obviously I can't build this without users, but I think this is a good idea if that's what you're suggesting
The market for personal medical gear comes to mind. Wheelchairs, walkers —- unfashionable but important things. Speciality stores for this come across as a rare essentially different retail experience.