In some mobile apps, their are ways you can get more "unlock tokens" by completing an incentive offer/survey. Can these offer/surveys be completed daily? weekly? If i wanted to use a similar approach, what issues would be common when using incentive surveys/offers? I'm thinking that people will try to spam the offers. In which case, I hope the network can just make duplicate attempts "invalid". I'm signing up for CPA networks with a variety of incentive surveys/offers now so wish me luck!