Of course, this is not always the case especially if you have just started promoting your product. There are still a lot of things that you need to do to get your product or service to the online market. Most often than not, a tremendous effort on your part will be required.
Selling products online can be done in several ways. In fact, there are so many ways that you will have no excuse for not succeeding in the business you want to venture in.
One way of selling products online is by joining subsisting domains like the widely known amazon.com. You can list as many items as you wish to sell and for every sale, you give the site a percentage of it. So, there is mutual relationship. They help you and you help them.
Another way is through auction sites such as eBay where you can post your products and allow people to bid for how much a product will be bought for.