Testing once per week is $4 per day, which definitely adds up. But if you do this testing staggered across a population, you interrupt a whole lot of transmission chains.

Not to mention a whole lot of the $30 is the disposable bluetooth scanner. If you wanted to do this kind of antigen test repeatedly at the population level you'd make different choices.

We in the US spent something like $7000/citizen on stimulus so far though, so $30/test gets you a lot of tests if it mitigates the economic effects of the virus.