I'm still not able to find the user or post I'm searching for. I'm certain they made the post in 2011 and said "magic internet money" but I can't find the post from that user or even that user at all no matter how much I search. It's extremely odd.
It looks like this phrase was first used
in 2012. Unless an earlier post has been deleted years ago (before scraping them),
this is the first reference to "magic internet money".