The insanity is the only people who are going to pay this tax are people who either really love the couple of gun shops in Cook County, The uninformed and people who simply can't afford to drive the extra half hour or so to the many gun shops in Lake, Kane, McHenry, Dupage and other counties.
Then again the question becomes how informed is the general gun buying public; will people even notice the extra $25 fee? Afterall there are over 30 million gun owners but only 3 million NRA members. Its actually scary how many gun owners I have met, my brother in law included who just have no clue what kind of attacks are constantly being levied against the 2A.
Don't worry though, just like with cars Cook County will then start "demanding" that other counties collect the tax against Cook County residents.
"....The swords of others will set you your limits".