Go to dancesafe or pillreports... read what the person claims was a "double stack", or "Triple stack" inside of their description (what their dealer told them). Compare the numbers.
Why do people sell pills that are strong MDE or MDA as "double" or "triple stacks" then?
There is not knowledge from many people about the pills they are taking (you telling me everyone reagent or gets a gc/ms testing? No.)
Tolerance: If I've never done E, and you've done it 50 times.. my opinion of a "double, triple stack" will not agree with your opinion! It wouldn't be as strong to the experienced user!
I have no initial dosage that a "single stack", nor do I know the amount of MDXX versus the weight of the cutters (nor what the cutting agents are!).. You're telling me you can determine pure molly, whether it was cut with, amphetamine, methamphetamine, caffeine, or other desiger drugs? Sorry.. not plausible.
If I knew 75mg was a "Single Stack" your theory of Double, Triple, and/or Quad stack would apply. But no one knows the mass of a single stack.
Until this can be disproved, then I deem "stacks" sales marketing.