Yes of course, once you have built a following you can market to them. Remember to build an email list and contact them regularly with what you are doing. A good way to create your ebook is to get your readers involved, ask them what they would like to see in the book and choose the most repeated responses and then sell it to them.
Here is a great example of a photographer that is making a killing from his work and he started out with a photography blog. He is a brilliant photgrapher too
you can get some great ideas from this site for your own