Investment groups that buy troubled assets are beyond my scope of understanding, but is that what is happening here? It sounds like Theranos is purporting to have a functioning product/business plan in the near future.
I work in medicine so my colleagues and I have been following this farce for several years. When so many advancements and biomedical research can benefit from such funding, why throw money at this fraudulent company?
Edit: Many thanks to users hkmurakami and ukulele above for explanations/clarifications.