Their motivation is not “is this thing I’m buying going to be useful to someone?” (although that’s a nice side effect that gives them something to talk about at parties.)
Rather it’s: “Can I offload this thing I bought with exclusive access to someone else in a reasonable time horizon?”
Tokens and other crypto investments have been attractive to VCs because there was a steadily rising level of interest and a regular cycle of hype booms that make for great exit opportunities. (See the timing of Coinbase IPO.)
If there’s a good chance of exit in 3-5 years, it makes absolutely no difference if the project never ships anything.