[asicsp]

>You could always publish the solutions in a separate paid ebook

Yeah that's an option too, especially with gumroad/leanpub providing version/packages for such cases.

In my case, I provide my ebook for free online (inspired by FOSS and authors such as Al Sweigart and Allen Downey) and charge for pdf/epub formats. Good enough to pay my living costs (and a bit more in recent months). So, I don't mind providing solutions as well.