I think that the campaigns that conduct the Bounty campaign expect a certain number of participants. But when they are not enough, they extend the timing of the campaign.
I am more looking towards their sales that have not hit the maximum target, the small number of campaign participants should make them less in terms of payments and their purpose only to increase promotion for active investors, with the current trend that is not balanced with the amount of ICO that appears to result many projects lost their target investors and eventually they chose to extend their ICO.