If he bargained someone down from...
...the full price of MS-DOS to what I think he described as 'a pittance' then I'd say he was a good businessman.
Obviously, MS were desperate to build a monopoly and could be forced to give their software away if you were aware of it.
Still the same today - if a council says it's going to migrate to OSS then MS will come over and give you millions of pounds worth of software for free. It worked for Newham council and I'm surprised more councils and companies have not pulled the same stunt.
Of course, you end up with MS software and nothing works properly but hey ho!