If the customer had to go to three different app stores
to get what they want or just one.
Personally I go to Google and type "best free iPhone apps", and I also ask friends for their preferences.I also have one mall where I make all my shopping and one phone carrier that provides me with what I need.
BUT I CHANGED my phone carrier twice in the last 5 years, and I ended up with one that has better contractual terms and lower prices.