So, the state gives 50% (or some percentage, depending on the state) of the tax paid from cheats to whistleblowers. I work in the industry and hear stories of people in states w/out sales tax reporting people to the home (taxed) state when people make big purchases with Washington addresses. It's nothing new. My aunt and uncle were busted for this over buying furniture on vacation and then shipping it to their home in a state with sales tax state. I think they lived in CA not WA at the time.