While it's an absolute fact that you PROBABLY will never get caught, it's also a fact that you're SUPPOSED to report all income.
However, I think you're good to go, because there's like an exemption -- although they don't call it that, exactly -- of the first $400 of income.
If you printed off the forms, when you get to the part where you've figured your income, it says something like "if the amount on line 72 is less than $400, stop here. You do not need to report this." (Not precisely, but that's the general gist of it.)