Very true. Look what happened to the first Japanese birthday pikachu. The price dropped significantly after the release of the English version. Now don’t get me wrong, it was not as rare as it was touted to be and Pokemon was in its heyday… but if that card was never released in English I could guarantee it would command a higher desirability and price.
…but lets look at the opposite end of the spectrum. The infamous Computer Error card. It has seen, Jp CD release, coro coro release, an English printing and the Kamex. However one of its 4 variants brings in major cash due to a different drop shadow.
I think It has less to do with how many release a card sees and more about the story behind those releases. If you have a good story and it stirs up a feeling of nostalgia, older collectors will be all over it