skurfer/iTunes-qsplugin — comment on commit 49aeba86b674623e0d9040db44fbe3a966e8c4c4
File: Code/QSiTunesSource.m line 811
By pjrobertson:

When exactly does LaunchServices NOT launch Quicksilver? Most of the time?

If that's the case, then this is going to rescan unnecessarily every 10 minutes. If it's rare, then I guess it's fine.