I've only ever done full length brews. Going to make some beers that I like the sound of, but don't want 30 odd bottles of, starting with this one.
I must admit that it seems a lot of effort for anything less than 10L though, but I get your point about using up left overs. Must be really annoying if its really nice though!
Glass half full - it's a bonus beer, even if it's only seven bottles!