The simple answer is yes. Even Google, one of the biggest online companies in the world and Amazon, probably the biggest ecommerce store ever can definitely make more money online than they are now. Thanks to the popularity of the internet, the rate at which people are getting online around the world and the speed at which technology is helping us log on faster and more often, there will always be more money up for grabs.
You will be pleased to hear that your website can make more money online one way or the other. There are so many opportunities and an endless queue of customers looking for your product no matter what it is that will pay for it online. You could open a shop in the middle of nowhere, with one obscure product, and with the right online presence you could sell hundreds of them.
All you need to do to tap into this stream of cash is to make sure you have explored all the avenues open to you online. Say you are starting from scratch, search engines are a good place to start. People search for products all day and all night and when they type the name of it into a search engine they hope to see a suitable example at the top. By using a technique called search engine optimisation you can appear at the top and get customers that way.
Another way to make more money online would be to get you listing to appear in other places in search results such as in places listings (which display businesses available in the area a person is searching from), pay per click adverts (which are adverts which you pay to appear at the top of search results) and in shopping search results (which allow you to upload your product descriptions to a central searchable database manned by the search engine). All these together will bring you yet more cash.
Above all, to make money online you need to make your website work for your visitors. Make sure you have a good payment service provider to help you take payments and a facility for online credit card processing that is easy for you and your customers to use. By making sure the experience they have when they arrive at your site is a good one, they will be more likely to make a purchase or come back again later.
Once you have addressed all these points you should hopefully see a marked improvement in your income online.