All patents have value
A patent is only as valuable as the invention the patent covers! In other words, if an invention has a low potential of creating an income stream, the patent has little value. Remember, patents can only be used to exclude others from making, using, or selling the invention as covered by the patent’s claims.
https://www.invention-protection.com/ip/publications/docs/Common_patent_myths.html
Patents only have commercial value if they can be used to protect a profit stream by excluding others from making, using or selling whatever is covered by the patent’s claims. If a patent is not used to protect a product, service or process (or license to others) there is no inherent value to the patent.
https://www.denveriplaw.com/a-patent-primer/top-10-patent-myths/
Patents are valuable - Patents
may have commercial value but that usually depends upon how it has been used.
https://www.lib.utexas.edu/engin/patent-tutorial/
In other words:
A patent does not need to be useful to be granted
However,
It needs to be proven useful to have value