Seems pretty reasonable to me if it's as useful to people as it appears to be judging by the comments here. Personally I'm willing to even pay a slight premium

Seems pretty reasonable to me if it's as useful to people as it appears to be judging by the comments here. Personally I'm willing to even pay a slight premium for non-subscription options too. I find it's important to know what you're buying though; particularly if the thing it's targeting is changing rapidly, like an IDE for a modern language, or something else they know will be made obsolete in a short time. A book on Android 1.5, or Kubernetes Pod Security Policies doesn't (didn't) have much of a future.