No, that really isn't helpful unless you want a novelty domain name that nobody else (roughly speaking) can resolve. (And which, as a result, you can't send or receive email from, obtain an SSL certificate for, get indexed by search engines, etc.)
I still think it might meet OP's requirements: "I just need to type something in that's not the IP address of my VPS".
Sure, there might be other requirements, and it's not clear what the exact use case is, but it also might be useful.
I mean, if your only requirement is "I need it to work on computers that I've specifically configured to make it work on", you might as well make your "domain" an entry in /etc/hosts. It'd even work more reliably.
For sure there are also other use cases, where just putting entries in /etc/hosts is not enough and it's useful to add one more entry to DNS resolver on machines that should be able to reach specific and probably dynamic destinations.
That's actually a fun exercise to come up with these use cases.