For the first time I have just fallen for a deck worth over 100 bucks.
I don''t know if 'worth' is an appropriate term with a lot of tarot decks being sold for high prices.
If the deck has some intrinsically valuable factors-- higher-quality cardstock or printing quality, gilding, a self-published artist's original artwork painstakingly produced at high cost over a number of years, a famous artist's original artwork for tarot--then we might say the deck's price reflects a more objective value.
But many decks that are priced $100+ online are in fact mass-market decks that have gone out of print and that are only currently, artificially inflated in price due to supply and demand (demand naturally going up when there's less supply). Many of these decks were ignored by many while still in print and readily available--indeed, some were mocked or widely given the "thumbs-down."
These decks' prices might currently be high, but that does not mean there is an objective consensus that they are "worth" a high price. And prices do fluctuate over time according to trends in the general culture as well as within tarot; just keep that in mind.