I would be great if you improve the oculus environment as in some 3D chats like There ( there.com) by awarding points or hearts to players and then using the points to give free stuff. That would also helps to buy games. A system like this:

1. Points / hearts for time using the device.
2. Points / hearts for number of apps downloaded.
3. Points / hearts for using specific apps like Oculus rooms, etc
4. Points / hearts for buying games over $5.99, etc.

Free stuff to redeem points:

1. Customizations for the avatars.
2. Customizations for the oculus rooms.
3. Games (Totally free or mix $ with points)
4. Things to add to the oculus rooms, etc.

Meaning your killer app can be what you already give free but with a better environment.

Cheers!