Just because a dragon isn't infernal doesn't mean you should ignore it
So many low elo junglers like to ignore dragon. "Oh it's just cloud Drake no big deal, let's try to siege mid instead."
Let me tell you a tip. Getting Drake's are much, much safer early game to capitalize on than a tower. After a successful pick, if you rotate mid you will do jack shit damage to the tower. Plus, death timers are so low the enemies will probably respawn, kill us, and take dragon themselves. Stacking Drakes is even more important because even if you don't see them useful, you at least take them away from your opponent and get free gold.
When late game rolls around, those triple stacked dragon buffs are going to bite you in the ass. "Wow the enemy team is so hard to catch and when a fight breaks out their whole team gets there faster than we do!!" No shit that was the three cloud drakes you gave up for more mid farm screwing us and now we lost Baron. And when the enemy team gets the elder drake, you will question why our tanks just get melted in team fights.
It's not all about the infernal dragon. Think of dragons like a bank investment for the late game and contest every single one you can.