I have posted 2 articles before about how to make money with app trailers, my App Trailers guide/review and then I showed how to automate the viewing of trailers.
Unfortunately for me, I abused the automation and got my secondary account banned so I had to find a way around the ban so I could still use the automation. In doing this, I figured out how (if you have at least 2 iDevices) you can give unlimited referrals to yourself. Each referral is worth $1, so that adds up fast!
The way I have this set up is I have both an iPhone and an iPod touch. My iPhone has my main app trailers account, which is linked to my Paypal, on it. My iPod is jailbroken (click here for instructions - iOS 5.0.1) and I use it to automate viewing and to get the referral bonus on my main account.
Once you have jailbroken your iPod/iWhatever you will have a new app installed called Cydia. This is pretty much an "underground" app store. You will be looking to get an app called UDID Faker.
Open Cydia and click the manage tab at the bottom, then select sources. Click on Edit, then Add. This will prompt you to enter the URL of your new source, enter http://sinfuliphonerepo.com and confirm. Cydia will display a warning but just click add anyways.
Next search "UDID Faker" and install the only app under that name. The install button will be on the top right after you select the app.
Now let me explain what this does. Every iPod, iPhone, and iPad has a unique series of numbers and letters assigned to it, called the UDID. This is how apps are able to recognize when you have already used it before. By using UDID Faker, you will be able to trick App Trailers into thinking that you are a brand new user EVERY time you use it if you choose. Alternately, if your account gets banned because you were not careful enough using my exploits you can use this to get a new account set up!
Open up UDID Faker, and select App Trailers from the menu. Then just click the Random UDID button and exit the app by tapping the home button. When you open up App Trailers it will treat you as a brand new visitor! Go to enter bonus code and type in the code from your main account, or use mine if you're feeling nice - expectedroute
This is also a great way to get around getting banned by App Trailers. I hope to find other apps soon that will allow you to do this with referral systems.
EDIT: Unfortunately, I had typed this up a while ago and had not used this method for a bit. It would appear that this method is no longer working, but I would try it every once in a while just in case. I will try and find another way around it. Wish me luck!