This is a really, really good question!
While I wouldn't necessarily call what I'm building "wrappers", although others might disagree, I'm not making any revenue from them currently, however my market is more developer tools & enterprise.
I AM however, getting lots of value from having built a lot of tools, but by virtue of hands on experience with the tech (I'm a SWE), and reputation as someone who's actively integrating the tech, not sure if that counts haha but it's helping my career at the moment!