I did work for a company where they had a few important vendors who would run legacy versions of their software and demand a bugfix for that version. They did t

I did work for a company where they had a few important vendors who would run legacy versions of their software and demand a bugfix for that version. They did this only once or twice a year, but being able to reproduce and patch old versions was enough to get some clients to shell out absurd amounts of money. These companies were swimming in cash and didn't like to learn anything new. Needing old commits is rare, but important.