Of course it would be awesome if you could design and create some billion dollar web page, or one like Amazon dot com that is worth hundreds of billions. That is highly unlikely and it would be a big pain in the rear. Obviously that was something that was started way back when the internet was young. They obviously sell all sorts of things you could never imagine, like supplements for example. I have no clue what rhodiola rosea is or what it is supposed to do for you, but you can buy the stuff on Amazon. I know once you could buy the parts you needed to build a house from the sears and roebuck catalog and I would guess that you might be able to do something similar on Amazon. They literally sell just about anything that you could imagine and a lot of things that you would find difficult to believe that anyone would want.
The trouble with starting another web page to do e commerce is pretty simple when you think about. Amazon and all those other web companies are going to be there already and they will be tough to compete with and there will always be some company selling the same thing you want to sell. If it makes a lot of sense to sell it on the web, then there shall be hundred of competing companies. DVD’s and books are perfect for this sort of thing, in fact you can sell either of them as ones and zeros and deliver them by download them in a few minutes if your connection is really good. A random person like me could never compete in that, since they would need to have a significant amount of investment capital to make it work and that is not the case.