Tax money goes to training folks on details of the laws and their enforcement. Since these are registered items, tax money goes to maintain the database. Presumably people have been charged and convicted for violating those related laws. Tax money pays for the enforcement, due process and punishment of the violators.
Without the firearm attached a suppressor, IMO, is singularly ill designed for use as a weapon and certainly not more lethal than a standard piece of pipe or other blunt object.
The price of these items varies. I'm not seeing that adding $200 to that price and wait of 7-10 months will make them better or safer in any way.
The ATF restriction makes even less sense that most of the war on drugs or building the trump wall.
Waste is waste and as bad as it is to spend money for nothing, punishing someone for owning safety equipment is insane. 
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