I second that. For Etsy, PayPal, stripe and most likely Tradesy $20K+ OR 200 sales will be reported, i wouldn't rely on what Tradesy reps tell you on the phone (struggling actresses in Santa Monica with ever changing Tradesy rules).
Now. you need to report every cent of PRIFIT to IRS, it doesn't have to do anything with if it's hobby or not. If you sell any personal item (not as a business) and made $1+ profit you need to report it, it's stated in tax form footnotes and was confirmed by my tax accountant.
Personally I don't sell at profit, it's either a bit used bags at loss or new at face value.