I agree that grant proposals should be published. However, as with all other scientific results, researchers should decide if they want to publish or not. Also, sensitive data like financial calculations, may be removed before publication.
For example, we published:
Cimiano P, McCrae J, Jahn N, et al. CONQUAIRE: Continuous quality control for research data to ensure reproducibility: an institutional approach.; 2015. DOI:10.5281/zenodo.31298