speed paste - still don't get it

So from all the research I've done.. I still don't quite get why speed taste exists.. apparently it's a Europe thing. And the actual powder is washed with acetone - WHY ?

I've heard it's more potent - that would make sense. I've heavier - obviously because of the fluid - that would make sense from the selling standpoint - but why would a buyer prefer it over powdered form ?

I am a beginner (just took my very first dose of dried speed taste - insuflated 7mg. I've read 10-15mg is a good starting point. But since I know my body and that I am mostly quite sensitive to any foreign subtances - I took less. And I am happy with my decision. After 5 min I am feeling quite strong efffects already - and my purpose it purely performance and productivity. I am perfectly happy and content when I am sober. I don't need to 'fake happiness'. Although I got the same 24 hrs than everyone else and 2x the amount of shit to do. So I could use a bit more focus.

My father is a chemist - not me. I've done research on this, but someone please clarifty this to me. Difference between amphetamine (like aderall) and meth-ampethamine (like speed) - the former just makes you focused and energetic, while the latter also happy on top of that. Correct (I know I am making it more simple than it is, but maybe this explanation will help other noobs like me understand it better).

/edit: If I could edit the title as well, I would. As you can tell, I am on it right now - started with one thought and wrote 5 more in a matter of 2 minutes. I apologise. I know this community is very understanding. My only limit right now is typing speed, as my grip is fucked up from heavy lifting in the gym yesterday and lack of proper sleep (I am a DJ).

Thanks guys.