MDMA doesn't work the second time you take it the same day, you won't feel practically any effect at all. You have to wait some time. The next day it might work a little but if you try to do it 3 days in a row that's not going to work.
It's also dangerous to do it that often. Minimum time between doses should be 3 months to be as safe as possible. People who drop more than once don't understand how it works and are just setting themselves up for medical emergencies.
