So, this article identifies broad classes of actors ("VCs", "angels", etc) and attributes motivations and patterns to them.

However. there are very big differences in behavior in sub-classes inside these groups. Top-tier VCs, low-tier angels, etc. The types of deals that these groups are willing to engage in differ radically, especially due to the ecosystem and the structure. This stuff isn't particularly apparent until you spend a great deal of time understanding the structure of the marketplace...