Before last update, the volatile magic gain with the infinite tools was as follow :
Basically, whatever the node you were gathering, you had a total of 3-9 VM.
Now, harvesting nodes only reward 1-3 for the whole node.
This change was unannounced so I believe this was unintended.
However, I must say that if it IS intended, then I am pissed. This changes the whole value of tools, cutting the VM gain by 66%. This is NOT what I spent my money for.