Although you're right and the people doing this are probably ignorant at best, it's quite clear that you've never tried MPA and have no intention of doing so -- moreover, you seem to have a specific loathing of stimulants based on your posts in other topics. I'd advise you to stop offering your opinion on things with which you have no experience and stick to your health warnings which are, at least, somewhat useful despite their backhanded and condescending nature.
I've done amphetamine, MDPV, alpha-PVP, caffeine (high doses), 2C-E, 2C-D (it, 2C-E, and amphetamine were the best stimulants on the list, and it and amphetamine were the best), 2C-I, 2C-P, 2C-T-2, 2C-C-NBOME, 2C-I-NBOME, and 5-MEO-MIPT. I've consumed about a gram of 2C-E and 400 mg or so of 2C-P, 2C-I, 2C-T-2, AND 2C-D. I've consumed over 100 mg of 25C-NBOME and about half as much 25I! (Not all at once of course, I mean in my whole life) All of those stimulants that were also psychedelics were oftentimes taken as a stimulant rather than a psychedelic (not recommended, felt really good, but it can cause heart valve damage via 5HT-2B agonism and I can ACTUALLY feel my heart beating in my chest especially if I lay on my left side, before phenethylamine and pyrovalerone use this was not noticed, for whatever reason (placebo effect is entirely possible)). I've probably done more stimulants than a lot of people in this thread, and I certainly do like the feeling of stimulants. I do have interest in stimulants, there just doesn't appear to be any good ones on the research chemical market, besides amphetamine analogs. Just because I don't do shit stims like MPA doesn't mean my comments are backhanded or condescending. Your post sounds condescending to me, in fact. That's why I go on places like Bluelight, Pihkal, Tihkal, Erowid, so I can know if a chemical is shit before I acquire it. Not the best choice however, because you have to study Bluelight hard to get the proper warnings, and Erowid or Pihkal don't say shit about heart valve damage from 5HT-2B agonism.
Also Dave, as long as u have a few benzos handy, I can almost guarantee that if yoiu stic to less than 100mg MPA and ess than 4 beers you won't have any bad effects, just good!
wow, without the word almost this would be one of the worst posts on the board. When you say bad effects I assume you mean instant gratification, because the real bad effects from a drug like this come years later, or from overdose. Don't encourage people to get so inebriated they do not notice the damage they cause themselves.
ositive effects ratios and how/why they might cause certain negative effects, If anyone has any of these hunches and wants some questions asked to probe into their ideas of the pharmacodynamics at play when you take MPA. 
