A bit late on the thread
I remember once David of Wolfire games posted this on their blog. Here is the link Why we are not using Euphoria - Wolfire Games Blog
It has the reply from NM. It said, “Euphoria is currently not available to the public, we only have deals with a very limited amount of publishers and quite frankly I assume it would be much too expensive for what you are doing, sorry.”
It is an old post though don’t know how much have changed since. And yeah Giant bomb page says NM charges at least six figures for their services.