sparknotes are worthless

im not saying i cheated but i did try and look up sparknotes on my book just to see how it would be summarized
and what do you know my books not even on there! along with not having every book like you would think sparknotes takes away so much value of a good old fashioned book. how are we suppose to learn if we read how some random person summarizes the book? anyway i think sparknotes as a light and dark side. it could either help learn or it could just completely devalue the point of reading. in the ways that it could help learn is it could give a second opinion to someone who has once read the book then read sparknotes  to get a second summary. it could also devalue the book by those who dont read the book and get the full enjoyment of it and instead look up a summary that could possibly leave out a lot of details to the book. so what do you think about sparknotes? good or bad?