From a legal point of view, piracy is piracy as long as copyrights haven't expired. This is the way things are, and even if it's not really enforced it's still copyright infringement. With that said, I do understand that the PC-98 games are well beyond reach for most people. If you're the kind of person that respects ZUN for what he does, it won't hurt to throw a few donations his way. I feel like he'd certainly appreciate it if those who are unable to purchase legal copies of his works send some cash his way. Of course, if you can purchase games and CDs easily (Amazon.jp comes to mind, as well as the multitude of proxy services), you should always go that route. If you absolutely want to play the PC-98 games and you feel bad for contributing to the rather rampant piracy scene you should definitely make up for your inability to purchase games that wouldn't support him at all in the first place. If you think about it, it's highly unlikely you'll support ZUN in any way by purchasing the PC-98 games on floppy or as the CD compilation. Unless the seller gives a share of the exorbitant money (s)he charges for the games it has the exact same financial effect on him as piracy. This is a problem not only with games, but with any sort of collectible item. Do you choose to support the creator, some random person trying to capitalize on fans for a pretty penny, or, in the case of digital media, break copyright law by receiving unauthorized copies? In the end the choice is really yours, since everyone has different thoughts on the matter.