When it comes to marketing your ebook online, you can do it without a sweat. You should know that if you wanted to boost your ebook customer list, the fastest way to do so is by investing into advertising... in particular pay per click advertising. If you can make this medium profitable, you could make money on each initial sale, and also gain a new customer in the process. Now this is very important. Nothing is more valuable than selling to your existing customers over and over again. You see once you acquire a customer for your ebook, you don't have to pay anything else to acquire them. You've already got them, and they have bought your ebook... so the next thing that you will want to do is to sell them on another ebook that you have.