It's a thing I've seen people do. Visiting a neighboring city to take advantage of their tax holiday for back to school shopping, for example, or buying a car from a neighboring state to avoid in-state registration.

People avoid taxes all the time, it's just that 5% savings on an average income doesn't save millions of dollars and cause Twitter to hate them.

Personally, I take the mortgage interest deduction, claim my real dependents, and put as much into my 401K as is legally allowed. Those are all tax avoidance strategies that people routinely engage in.