I won't argue with that, but I think it's more complicated. For an average Japanese person such price might be bearable, but for me, in a less well-off region of the world it often isn't (and I think many VN fans are in similar position). Also while older video games typically get much cheaper with time, visual novels often follow very stiff pricepoints - even when they're more than a decade old they can cost a lot. For an average gamer, there are many ways to economize his investments without doing anything questionable - as I see it now, with VNs its much harder. And the producers would probably gain a lot from making classic VNs more accessible, while still charging (justified) full prices for new products and things like HD re-releases and such.
As more and more VNs get Steam releases, with slightly lower prices and regular sale discounts, it definitely gets better, but as I mentioned Steam has its own problems, especially when it goes adult-oriented titles. I didn't say it to justify piracy (apart from abandonware I never do), just to show that people have strong incentives to pirate VNs more than many other types of media.