You just need to know your basis cost (including transaction costs) and approximate purchase date. I don't know how others do this hobby, but I'm in the red for every component I turnover so it's simple matter of recording the lines for your "loss, no net profit" on your taxes. Had to finally deal with a PayPal 1099K from last year, and will again this year. A little hassle, but not too hard, and impacted my return 0 dollars.
My situation exactly. I basically pulled all my purchases for items that I sold (where the buyer paid using PayPal) by taking screen shots from USAM, some going back several years. Lost money on pretty much every transaction, with an overall net loss. My tax preparer had no issues with it.