Have you seen the prices of legit prebans? Let's say I'm a shop - I can make 10-15% off a new AR and risk(albeit minimal to non existent risk) hassle from the AG's office/FRB/local licensing authority with potential legal fees to fight the good fight, or I can buy pre 94 AR's at 1750 and sell them for 2750. And if I'm feeling really frisky I can sell lowers marked up 600% and let you, the customer, assume any "risk" of non compliance.
As for the pre-Mora language, numerous shops in MA try and convince people that Mora is perched atop their home waiting to attack should they even glance at a pre-edict rifle, and some dealers even have Mora's office on speed dial. Fear is good for business is some cases.