right now dragon is near worthless
if you solo it at level 3, it delays your level 4 so much, the enemy jungler will get a huge lead that is greater than drag.
right now stealing dragon to die is not worth unless you have a huge lead or its stopping them from getting 5th dragon. if the game is equal, the enemy can push 1-2 turrets, worth way more than drag. or even worse, they take baron and then melt all your turrets.
i think the 2nd and 4th bonus needs to also offer combat stats, because right now dragon is just a bait objective.