Anyone had much success with apps?

Curious if anyone here has tried their hands at apps - cpa offers specifically - and had much luck? I imagine traffic would convert much higher and I'm sure you could get rev-share on new customers (albeit I imagine people looking for an app would generally already be members with said bookie) too if the site has the right architecture and content. I've also seen one site doing this that looks to have diversified income by creating their own app to get more affiliate sign-ups which is pretty clever.

Seems like it could be quite profitable, what with mobile being the future and all.