Earlier quoted context omitted.
Now you have to build two successful products: one to acquire customers, and one to sell to them.
You mean one to acquire customers and one to do customer fulfillment. And customer fulfillment is useless if you don't have any customers. This seems obvious.
Name some successful online commerce companies that started that way. Most (I won't say all) started as pure commerce, e.g., Gilt.
If you're ShoeDazzle selling shoes for $40/month, your customer acquisition problem is fundamentally different than a site like Svpply.
If you want to sell things, sell things. Don't try to play 3d chess.