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Have you tried this venue to determine profitability margin of your sale and such cost-benefit analysis around financial analysis using Microsoft Excel spreadsheet? It is very useful tool.
You can also research online search such as Google or Yahoo on mark up margin to make money, or something like that.
As for how many book sold and all that, I think it is individual’s privacy issue, and it is up to someone else to disclose such information in public. For me, I am not at my liberty to disclose as such, because I feel it is none of some people’s business. But it is up to you or for some people for that matter.
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