There are many navigation networks, but there are not many truly distinctive ones, and there are even fewer fine products. You can do a certain kind of navigation, not the whole industry, which makes it much easier.
Of course, promotion is very important. If you want to be a commercial website, the most important thing is to figure out how to do it and then how to promote it, otherwise no one will know how well you have done it. If you just do it yourself, it doesn't matter.