I support the social aspect of guilds as well, and I agree with the points you made in your post about guilds forming communities, having rankings, ways to communicate, etc. I don't think guilds are a great solution to the problem of investors not wanting to actively curate though, nor do I think it is generally a good idea for stake to be "rented out" (even more than is already happening). Stakeholders banding together to cooperate, exercise quality control over each other, and function as a community I do support.