You don't have to spend the extra money on things that will blow out the schedule. Anyone aware of the realities of software development enough to think about

You don't have to spend the extra money on things that will blow out the schedule. Anyone aware of the realities of software development enough to think about capping the max should be aware of the mythical man month and cognizant enough to realize they can just bank that extra money as a rainy day fund for when the product almost certainly goes over schedule even with the original plan (Hofstadter's law).