IOS – Revenue for individual apps

You can link to apps in the appstore. For example:

http://itunes.apple.com/us/app/pinball-arcade/id455826958?mt=8

(This is just a random app I picked to serve as an example)

Now, if you have your link to your app, you can:

• Write a blog about the app and link to it
• Have websites review your app and they will link to it
• Does your app serve the need of a particular community? Maybe they have a forum or mailinglist where you can link to your app and explain the benefits they will get from it.
• Tweet, facebook or Google+ about the app

Apple can reject apps which are duplicates:

2.11 Apps that duplicate Apps already in the App Store may be rejected, particularly if there are many of them, such as fart, burp, flashlight, and Kama Sutra Apps

^{Source: Apple App Store Review Guidelines}

You should only create one app and spend your efforts promoting this app. Furthermore, if you seek to make apps that appeal to users with clear functionality, Apple's interests and your interests will align. In the case where you are looking to ride hot search terms, unless your apps are really what you are seeding in the search terms - trying to work the system shouldn't work in the long run.