In addition to the filtering element, this strategy probably has a long term benefit. Those who reject the offer and join are likely to stay committed and enthu

In addition to the filtering element, this strategy probably has a long term benefit. Those who reject the offer and join are likely to stay committed and enthusiastic in order to be consistent with their original decision. The desire to be consistent is a hugely powerful force - read Influence by Robert Cialdini if you're interested.