Proportionately plentiful
With about $20 billion worth of cash on their balance sheet, Visa isn't taking any significant risks by plopping down $150,000 for an NFT.
Even CryptoPunk 7610, with her hot lipstick, is just a digital trinket whose value may rise or fall over time according to hype and popular opinion. For Visa, this amount can very easily be written off should things go sour.
For newcomers in the market, we should probably draw a hard line between the purchase of fungible and non-fungible tokens. For practical purposes, we should probably be viewing all NFTs as one might consider the purchase of an original painting.
Usually, the purchase will include some sort of personal affinity to the product in question, and some method of valuation beyond just what an illiquid market is willing to pay for it.
As with all new technologies, NFTs and fungible cryptocurrencies should still be seen as high-risk investments, and we should never invest more than we're willing to lose.