[2020] Why are you faking marketplace prices? Is it Steam or Unturned?

It's neither. People can't "fake" prices on the Steam Community Market. All buying/selling occurs between Steam users, with Steam just being a hub and taking a % cut from transactions.

If you're trying to sell an item like a common shirt (e.g., the Yield Hoodie), it's going to sell for 3 cents (USD). The "price jumps" are from people buying items in bulk, usually 100+ at a time. Either for personal collection, other market purposes, or to salvage them into crafting materials.

When people buy in bulk for these cheap items, there's thousands of items much cheaper than whatever you're setting yours at. And then, hundreds more around the same price as what you've set yours at. The likelihood of your item selling goes down quite a bit.