Collecting is a want, not a need. As collectors of beanie babies, baseball cards, comic books, tulip bulbs, and real estate (j/k) have found out, a collectable item is worth only what someone else will pay for it, and that could change at any moment. So you can NOT consider it as an investment or savings of any kind, nor prioritize it over getting your financial ducks in a row, any more than other hobbies/entertainment activities.
Depending on your financial circumstances, it could make sense to include a line item in your budget for collecting. Then you could make a game out of optimizing your purchases.