Except for the fact that the tradeoff is not worth it when the increase of damage you receive from it is less than the increase of damage that it does to yourself. And on top of that, why would you level up hellblade or any of those other abilities when you can just get lvl 1 Vermin Swarm or Leap; which do more damage AND have a lower blood cost.
And there's a big difference between resource management, and having to sacrifice half of your life to have a chance of killing someone. The metagame is already way too focused on burst damage, and if everybody is having to sacrifice half of their life to each of their spells ONCE, then burst damage will be even more prevalent than it is now.
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