Trust me, these policy-makers (aka Dems) know all too well what level of revenue the hunting and shooting sports industries generate. They know it because they invest in these companies in a hypocritical pursuit of profit, or they know it because they keep a watchful eye on "the other guys" in an effort to generate smearing mis-information campaigns. And they know it because they have ran the numbers on how much tax revenue could be raised by proposing the imposition of irrelevant and unwarranted taxes upon law-abiding ammunition, firearms, and sporting-goods consumers, and they've projected how much tax increase it would take to discourage consumers from buying them altogether, resulting in a "ban without a ban".
The people that DO need to know about this are the local consumer boards and governing bodies. These are the people that need to know how much revenue hunting sportsmen generate in their areas, and the level of the constituency base that supports the lifestyle.