Glad you enjoy your new interests. That is after all, why we do this in the first place.
One small piece of advice, don't sell off everything you have at first,,,,,,,,plastic modeling interests can go in cycles.
I started out in Aircraft,,,,then for a while, I reduced that and concentrated on Table Top wars with 1/72 AFVs,,,,,,then back to aircraft,,,,the 1/700 ships, and now back to aircraft and aviation ground vehicles.
I kept most of my aircraft stuff each time, except once, when I went to tanks.........buying things at the current price was quite a shock after selling off a bunch of that stuff at the discount it took to get it to move.
If you have the space, letting your stuff sit in short term storage for a while might save you money in the long run. And if you still decide that you are done with it later, it won't have lost any more of the value then versus now.
I look at those models when I run across them too,,,,,,,that Batman dio sounds like a fun "collection/diorama" build,,,,did you see Batman at the theatre in the sixties, or the TV series? (how old is Rex?,,,,,,old enough to prefer Frank Gerschwin's Riddler over John Astin's)
Rex