Dear Joshalee,
Hope you are having a good day 🙂! The 1099K reports gross income only, you'll report that income and any related expenses under a Schedule C (if you are in it with the intent to make a profit). To use your example, you'd report $400 as gross receipt and the cost of the ticket of $200 as an expense, net profit of $200 (will be subject to self-employment tax).
However, if you are not in it to make a profit, then this would be considered a hobby. You'd report your 1099K income on Schedule I, Line 8 of your 1040 tax return (the income will not be subject to self-employment tax). Unfortunately, under the new Tax Reform, you cannot deduct any expenses.
Hope this helps you! Please let us know if you need any further information.
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