IMO it depends on what the "review" entails. Certainly charitable contributions serve as an incentive for people to take action (see http://www.freerice.com/ h

IMO it depends on what the "review" entails. Certainly charitable contributions serve as an incentive for people to take action (see http://www.freerice.com/ http://www.freerice.com/) - but if you're asking for a lengthy, thought out review, it probably won't serve as a strong enough incentive.