That's because speculators know the party is over. You risk losing money if you purchase future contracts. right now, or for the last few months anyway. It seemsw like it found bottom and as the value trends up as production is cut, you'll again see speculation driving prices up. It's really not too hard to figure out investors. If it looks like the price is going to go up, it will as they all race for the limited resources, the oil futures.
There are other factors also, but it seems ike speculation drove the bubble up and the producers wanted to see it kept that way. They're doing everything they can to get the price back up so speculation will resume and they can further profit.
They have enough wealth to wait it out