Completely agree that any time you use an iTunes / App Store link you should be affiliating it. Not just for the 4-5% rev share but also for the ability to do some basic tracking.
The one additional piece I wanted to add is that LinkShare only manages the iTunes affiliate programs for US, CA and MX while TradeDoubler manages 29 programs in Europe and 10 more in Latin America. However, there is also DGM that manages the AU/NZ program and LinkShare Japan (similar name but different that LinkShare) that manages JP. (That turns out to 45 country-specific affiliate programs worldwide.)
It's important to note that using just LinkShare doesn't earn you commissions internationally. App Gratis was really smart about how they did their affiliation so that they used the right affiliate program/tracking parameters with the right country. Eg. Someone from Germany got a TD link, while someone from MX got a LinkShare link, etc.
The one additional piece I wanted to add is that LinkShare only manages the iTunes affiliate programs for US, CA and MX while TradeDoubler manages 29 programs in Europe and 10 more in Latin America. However, there is also DGM that manages the AU/NZ program and LinkShare Japan (similar name but different that LinkShare) that manages JP. (That turns out to 45 country-specific affiliate programs worldwide.)
It's important to note that using just LinkShare doesn't earn you commissions internationally. App Gratis was really smart about how they did their affiliation so that they used the right affiliate program/tracking parameters with the right country. Eg. Someone from Germany got a TD link, while someone from MX got a LinkShare link, etc.
Here is a breakdown of countries/affiliate programs/affiliate networks for the iTunes/App Store Affiliate Program (from our site)- http://www.georiot.com/using-georiot/itunes/affiliate-progra...