I think it really depends on the project. Ofcourse, they will be the one to decide to extend due to the ICO needs or the low value price of the market. That is given and understandable although some really takes time. Plus, given that the token amount is high, it doesn't mean that you get paid high as well due to the increasing amount of the participants. Therefore, the higher the number the participant, there are possibilities that you can get fewer earnings.