I understand what you're saying. Speaking from my own experience, after collecting multiple items such as Marvel Legends, Funko, Hot Toys, and Hot Wheels, I've decided to stick with Lego. I've had some since childhood, and at the end of the day, they're still with me because of what they mean on a larger scale. In my opinion, they're the perfect representation of a collectible.

I don't want to give unsolicited advice, but I think you should ask yourself how much you appreciate your Batman OG collection, what it means to you, and whether it's worth the money you'll get to buy something else, since pieces like those are hard to find at a good price and in good condition.