You are proposing he should also proactively refund the other ~40% of valid purchases to avoid the ~60% that end up in disputes? Did I get that right? If yes, that doesn't sound like a viable idea.
If it’s a SaaS business, that may very well be a viable approach. The cost of dealing with a dispute on the 60% of claims could be significantly more than the profit on the 40% that won’t be disputed. Additionally, the customers only get back the money for the disputed transactions, not perpetual future access to the software (as they would if it were a physical good, or a shrink-wrapped disc).
