Has anyone had any success in writing and selling ebooks online?

We have developed information related products with our other site and have been very successful. We have about 5 books on Amazon and also get some decent sales through them. There are so many ebooks out there that are of poor quality unfortunately it cast a shadow on all ebooks. The best sellers are manuals or more business related books. Most of the ebooks for sale are about internet marketing - an over done topic.

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We have tried buying some of the ebooks with private label rights but with so many other people doing it, the price of the books goes way down as well as the value you add.

Most of the ebooks that offer you private lable rights are terrible thats why they are almost free, you are better served writing them yourself.

We have written more manuals than ebooks and have had some success marketing them to existing customers

I have developed ebooks and have sold them as private label books. My attempt is not to try to make money on the selling on the books but the amount of traffic it generates when they click on some of the links inside the books - it is too early to tell if it is working. I will let you know.