Affiliate marketing makes it easier to scale because you're latching onto other metrics outside your own sphere of influence. Once you've found the product or service you can believe in, it's easy to promote that to people worldwide via the Internet. Furthermore, it leads you to ancillary products and services that might provide additional affiliate opportunities.
With drop shipping, you’re effectively partnering with a manufacturer or wholesaler to sell their products. This way, you don’t pay upfront costs to buy inventory, aren’t sitting on unsold items taking up expensive warehouse space, and don’t have to deal with shipping the products yourself. You simply create your site, fill it with drop shippable products, and drive in customers, with almost everything else done for you.