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How much time did you put into this upfront? Seems like the most "passive" item in the entire thread so far. Can I ask what book this is for? whats the lifespan of a solutions manual like this? Have you been selling it for several years or does it obsolete itself in sync with the aggressive textbook versioning schedules?

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I guess I am lucky that the text book still gets prescribe in some universities. I also think there is no other version of the text (I need to check that) I do not maintain it at all. And like I said, I solved most of the questions as part of the assignments and later worked out the left over ones, packaged it into a pdf.

When my professors found out that there was a solution manual floating about, they changed the textbook. Apparently all of the student's answers started looking the same.

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