You're special. You aren't the "people" I was referring to. States are strapped for cash and can't afford the enforcement costs. Hence the requirement in most (or all) states is simply ignored. The whole tax system is pretty much based on voluntary payment of taxes. When the majority stop paying, the country will go bankrupt. They can't put everyone in jail.
How many times have I read about folks buying ammunition or whatever out of state via mail order to avoid paying the sales tax? When Amazon starts collecting nationally, it will alter their business model. For my part, I do buy locally whenever possible and that includes ammunition if it is priced even close to competitively and pay the sales tax. But most people scoff at this view like I am a total idiot.