I was just reading the new tax changes for filing our 2024 taxes. One of the new IRS rules is about selling personal stuff on the trading/sales sites. It used to be you could sell up to $5,000 USD before getting the 1099K. This year, it's ONE ITEM! Regardless of price. As mentioned, this includes used stuff already taxed once. The IRS doesn't care, they believe they have the right to tax the air we breathe.
I have sold some of my plastic models through the consignment program my local hobby shop does, but have not heard if they are required to send me a 1099K, as they do collect state tax on the sales.
Going back to my ATS for a while.