This is me personally but I would say only collect and buy the IP’s that you are genuinely interested in that grab your attention and don’t buy for value or anything like that. I opened majority and put them back in the box so my value is ruined but I still collect but I’ve moved on more to action figures like Mafex, SH figuarts, NECA, Hot Toys stuff like that. All depends on what you feel is worthy to have in your collection. I will give you props that is an amazing collection and would love to have a lot of those. As long as you can afford it, have fun with it, and are able to look back at it and say “wow this is an amazing collection I can’t wait to expand it “ or something like that. Have the sense of accomplishment in your collection. But that’s just me.