Persuading investors: A video-based study
voxeu.org
voxeu.org
Here is VoxTalks podcast discussing this paper with authors: https://voxeu.org/vox-talks/pitching-passion
Here is the paper: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3583898
TL;DR Probability of funding increases dramatically with pitch passion, but it don't transform into company performance.
Unfortunately, when I asked "what about showing me the documents you have written when doing risk analysis, project planning, etc. ?" they were unable to show them saying that these are "still secret" or that "some external investors requested the executive board to not disclose stuff".
Basically, they were asking me to trust them, they were not giving me the tools to build understanding about them and, ultimately to trust them.
Needless to say I didn't feel much convinced.