Honestly, there's a lot of advertising out there that I think could benefit from direct monetary incentives. A large portion of the population is becoming resistant to regular advertising (good for them) and opting in to ad blockers when available. Actually paying people for the attention you're demanding from them would be refreshingly different... and heck, it worked for timeshares.

That's a good point. I got some in-game spam mail in World of Warcraft the other day with a few gold coins attached. Even though it was an amount you'd earn in about 2 seconds of playing the game (real world value: 4/100ths of a cent), it made me a lot less angry than ads usually do

Indeed there are groups and "businesses" that "pay" you to install apps. I assume someone is on the other side of that transaction paying for new user installs. Doing it yourself would probably be cheaper and you would probably be offering a much higher payout than those systems.

It's called "incent traffic" and it's notoriously awful traffic. Users are worth 5% of a normal user because they're freebie seekers who are usually broke.