Players will also be auditioning for next year playing time for their teams, OR for other teams. These “meaningless” games can sometimes end up with backups getting some serious dough for teams looking to improve. You mention Dru Brown, for example. If he has another strong outing, there is a very good possibility he will be offered a good contract elsewhere. Look what Arbuckle got after leaving Calgary. He hasn’t panned out but it stopped nobody from kicking the tires on him with a big deal once he was up as a free agent.
No such thing as meaningless games. Sometimes it’s the best arena for current backups to make a case for themselves.