Plus you can sell at a profit when prices rise, although you'll need a lot of storage capacity if you hope to earn anything remotely substantial.
You'll probably need a special license to sell oil in large amounts, considering the complications involved in storing, transporting, and disposing of it.
You can even take delivery in Cushing, OK if you want (but you don’t have to, as long as you roll out of the contract before the delivery date).
https://www.cmegroup.com/trading/why-futures/welcome-to-nyme... (CME Light sweet crude WTI)