"Yeah I don't know what the 200 stands for, but regardless I assume that there's an upper limit after which you can't absorb it so nothing more intense happens and it's just a waste. I think that's how acid works, not because I have any experience but because I looked it up and read it somewhere that seemed reliable."
Well Jamie DOES NOT LIVE IN THE USA so maybe they did things differently where he was but in my experience, shrooms are basically measured like weed, with the oz as a reference point and have never heard of any less than an 8th being sold. Half an 8th seems to be the standard amount that's consumed and is how much I've usually taken but I have taken a full 8th and it definitely wasn't twice the strength, which aligns with what you were saying. So I feel like taking a huge amount of shrooms wouldn't really cause you to have an extra powerful trip but would probably make you puke and possibly shit your pants (so that part of Jamie's story makes sense).