From what I understand, it's not even a render node licence. You have to pay a complete licence or rent it, even for a node (this is a floating licence ->7.5$ a day x365 = 2740$ / or permanent licence = 1220$). So basically, this is a true sodomy as they removed the only free "capable" render engine in max, aka mental ray. In other words, stay with corona which is an awesome, cheap and well growing render engine and save your bucks.