Isn’t that to much for such small e-book?
Are you buying books by the pound now? Measuring a books value by its page count is like measuring developer productivity in lines of code… you aren’t measuring what you think you’re measuring.
I’d rather pay $39 for a tightly focused book that gets to the point and teaches me something than a book that felt compelled to double its page count with extraneous information. For me the cost of the book isn’t the price, but the time it takes to read it and extract valuable information.
Don’t judge a book by its cost, but by its value.