My minimum order is one extra song.
Two and a half minutes of entertainment. Just a bonus track is enough to make me pay a few pounds more. If I'm buying material by a band I love, I want to buy all of it. A documentary is also good. (So long as it's ten minutes or more - I've seen a couple of documentaries where they might as well have not bothered.)
What else? An extra download, cover songs, a live performance, acoustics. Sometimes instrumentals, though not always. Trinkets, a poster, a print, a T-shirt. Frankly, I'm pretty easy - anything that adds value. But I don't have a 5.1 set-up, and I don't have a vinyl player, so they just plain don't add value.
Basically, I'll buy the most definitive version that's under £20.00. For me, a 5.1 mix adds no value for money (but doesn't necessarily reduce it - I've got Stupid Dream because there was other stuff there) and a vinyl actively reduces that value. As soon as it arrives in my house, it is nothing more than a comically oversized coaster, and I'm getting significantly less bang for my buck. Standard, this album cycle, is my only option.
I suppose I could wall mount them. Or make them into some big clocks.