They don't get a lot of practice repairing their products, unlike Leupold, dohhhhh!
Volume has its issues. Leica Sport optics is a small element of the corporate model. (Repairs don;t get much attention)
Leupold is 100% sport optics. (Repairs get 100% attention.)
FWIW:
Quoted from Sniper's Hide Official visit to Leupold:
"in an 8 week period alone, Leupold builds more scopes than Zeiss, Swarovski, Schmidt & Bender, Kahles and Meopta combined. So what these other companies do in an year, Leupold does in 8 weeks."
NOTE: I know leica is not mentioned.
Link:
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2436491&page=1BMT