Why does Instant Healing cost so much Endurance to run?
The high Endurance cost of Instant Healing is a major balancing factor for the power. When Instant Healing is on, the scrapper heals so quickly that he becomes a mini-Tanker. The Endurance cost forces the character to make tough decisions. The Endurance cost can be reduced with enhancements, but those enhancements are ones that could have been used to increase the healing rate.