An important question to ask every proposal owner is what they will do when the Dash price goes up or down.
Will they take on that risk themselves? Will change change scope? Will they come back and ask for more.
All of them are potentially fine but it's critical to know in advance and so I think it should be part of the information that's required to create a proposal.
Similarly we should ask them what they will do if costs turn out to be higher or lower than expected.