Because it's easy to mess up claiming the EITC and only low income people can claim it. Also, there's a lot more (relatively) low income people than high income people.
This also depends if by "audits" you include every kind of correction letter the IRS sends you.
I got a letter from the IRS today and thought it was some kind of ironic punishment for commenting this, but it turned out it was just warning me I'd used the website last week(??)
This also depends if by "audits" you include every kind of correction letter the IRS sends you.