Yeah, as they said, a lot of people just back releases they like so they can own a physical copy. Still, nothing wrong with just collecting!
Older anime definitely is more of a niche than more modern works. At the same time though, BDs can entice collectors of this stuff more than a regular DVD release. Look at how well the Bubblegum Crisis BD Kickstarter did for AnimEigo, for instance. I really hope that Anime Sols is able to get BDs to work for them, since I'm all for releases of great older anime in HD!
On another note, I heard that Dororo has a lot of talent behind it. I hope that they're able to get the streaming fully funded, and a DVD set funded afterwards. Since they're releasing a lot of Mushi Pro's work, I'm personally hoping they'll release Belladonna. Love the psychedelic scenes in it.