Personally, I scan when I have something to scan and I
have the time.
If I waited for the "right" time nothing would ever be scanned.
I don't have free time to scanning. It is TOO MUCH time consuming. And,
without ADF (accept donations :D) it is a pain in that place the sun doesn't
shine to scan.
BUT I use a lot of online documents, so I give back something to the
comunity. When I have something that rare, I do scan that.
A pain there, you see...
Alexandre :)