Case Study
Adding a Shopify or DTC store is worth it for an established Amazon brand once you are running external ads, because a landing page or store lets you capture email, own the customer, and still route buyers to Amazon to capture the ranking halo. The winning setup is not Amazon versus DTC. It is a loop where Meta traffic feeds both channels and each raises the other.
Run Meta traffic to a pre-sell page. Capture email. Give the buyer the choice to check out on your store or on Amazon. Buyers who choose Amazon feed the halo effect and lift your organic rank, while buyers who check out on your store give you margin and data. Either way you win, and the two channels compound.
Will a store cannibalize my Amazon sales? In practice it grows the total. Some buyers prefer Amazon and still count toward rank, others prefer your store and give you margin.
Do I need Shopify specifically? Any capable store or landing-page tool works. Shopify is common because it is fast to launch.