Remember the old saying, pigs get fat, hogs get slaughtered. It’s good to be aggressive in business, but down right greedy usually comes back at some point. A little goodwill can go a long way to keeping a customer loyal and make him feel you don’t just see him as a rent payment. Consider something like 10% on hardware because its always bothered you that the system wasn’t easy for him. Don’t admit fault on your part though. Explain that technology wasn’t what it is now.