1. LastFM has had an occasional problem whereby it just changes that number a little!
2. Never too much music: There is music for every occasion or activity or mood. Why, there's even 4'33.
3. Don't scobble what's not in at least intermittent hearing distance, though, or you won't be able to join the group(s) on here of real scrobblers or somesuch; but of course being an advocate of the Real Avatar, I would think that. :P