a sub (which can be easily imported from Japan if its that important to whoever)
Things go out of print in Japan too (surprise!). There are shows I've downloaded which cannot be bought officially anywhere
Or the prices are silly. One 2-cour show from 2006-7 I'd like is available (Japanese only) for a mere 54,000 yen on DVD (it's only 32,000 yen on BD, mind). It was released in English, and the early DVDs are easy to find - but the later ones or the Anime Legends collected box set have vanished from the face of the earth.
Oh, and as for buying Japanese and getting fansubs, remember that the European court rulings that frightened the owner of Nyaa into shutting it down were not about downloading or torrenting - they were asserting that the fan-subbing itself is in breach of copyright law