Actually MDMA has been shown to have positive medical effects for people with PTSD, psychotherapy, etc. Sure, it kills the serotonin in your body, but so does other things. I mean what doesn't cause cancer these days, really? Keep in mind every "drug" has been used as a medical purpose at some point in it's lifetime...
I'm just venturing a guess when I say most folks here at the RX are not using MDMA for its medical effects. I could be wrong.