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Pretty much will be until /etc gets lots of configuration files added.
The size of etc (12288) is exactly 3 disk blocks (mine is too). Frequently services will put multiple configuration files in one directory (as ssh does) partly for consolidation (all relevant files are together), and partly for security (it makes it easy to check the files access modes easily). A directory entry doesn't need a lot of space, so 3 disk blocks might not change...
lost+found is a bit more special. It has 4 disk blocks "preallocated", and is normally empty. The pre-allocation is so that IF a filesystem check (fsck) detects lost files, there is somewhere to put them, without allocating blocks from a potentially corrupted free list (a "lost file" is identified by fsck as an inode that isn't referenced in any directory). With the current journalling filesystems, lost+found is almost always empty as the journal will normally contain the list of transactions that have been outstanding, and the list will be processed for the initial cleanup. SOMETIMES a system crash/power failure can still leave some thing out though...
By default a directory just created gets only 1 disk block, with only two entries (. and ..), so the rest of the block is unused.
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