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The Pokmon booster box investment guide covers the same principles of sealed product value - scarcity, reprint risk, demand cycles - that apply directly to One Piece

Monster Tokens may be used as Tribute or material for Special Summoning methods (except Xyz Summon, as Xyz Materials are not treated as being on the field), but cannot be used to pay any cost that involve a monster moving to a specific location (they can be banished, as the banishment is not considered a location, but will still disappear permanently since they are leaving the field)

An opponent enchanted with Curse of Verbosity for example gives you extra cards when they are attacked

As it is not a Basic Energy card, no more than four copies are allowed