Answer to WHY?
-no paperwork
-no need to chase down the chief LEO & beg
-no waiting
-no need to spend $200 on a worthless tax stamp
If the rules should happen to ever change (or SHTF) I can always add a stock with less than 15 min. work.
Plus, there is the personal satisfaction of being able to legally circumvent the idiotic, worthless laws & rub it into the face of those who wrote them.