[titanomachy]

They couldn't even if they wanted to. E.g. Better social welfare, law enforcement, and education means less crime. Less crime benefits everyone in some way. Perhaps if it were made legal to commit crimes against people who don't pay taxes...

Even then, it would be basically impossible to avoid benefiting in some way without leaving the country altogether. There will always have to be at least some "core" services that everyone has to pay into, but that doesn't mean techlibertarian's idea totally lacks merit. Maybe some things should be partially opt-outable. Maybe people would start to question whether America really needs to spend half of its tax revenue on the military; maybe there would be more pressure to get some of the presently useless (and very expensive) 2.3 million prisoners back into the workforce.