People shouldn't be putting money they can't afford to lose or to which they need short-term access into these ventures anyway, but the moment any question about how funds are being used arises people are going to become understandably reluctant to leave their money in the hands of the person whose actions are under scrutiny for another day/week/month/year.

There's nothing to stop those who are willing to wait for payment from voluntarily placing themselves at the back of the line, but there's also no reason why others shouldn't require more information about how funds have been spent to date and just how large the hole is before deciding whether they're prepared to wait for payment or not.  Some people will let their investment ride on faith and others will want to recover what money they can and invest it in projects they consider more viable. 

With increased use of crowd funding comes increased accountability.  Investors aren't personal benefactors and that needs to be acknowledged by those seeking funding for their projects.