Is it a good idea to buy a core and max it?
Depends how inexpensive you can get a core. I was just looking and see a new H9Max is $599 US. I could be mistaken, but I thought they use to be $699 and was the price I was going on when discussing here. Heck for $599 I would get that and not have to deal with all the BS of going used. Unless of course you find a Core for very little money because the FAQ says it’s $300 to Max out a Core.
I’ll let others chime in with more info. I would probably contact Eventide regardless to find out the exact situation and cost with upgrading a used Core to a Max.