Comment: Do these people who don't pay

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In reply to comment: "They can't throw us all in jail." (see in situ)

Do these people who don't pay

Do these people who don't pay have any significant income, or are they all living very cheaply like you suggest? IRS agents go after the biggest fish so they can get the biggest commissions. If someone looks like they live really cheaply, the IRS probably won't waste their own time unless they make it to the bottom of the barrel.