Great questions.
>Do you think there may be selection effects in this type of donation model?
In short, no, because we leave patients posted until they are fully funded. More detail here: http://b.qr.ae/109DseY
>Do my dollars, etc actually go directly to specific individuals?
100% of your donation goes to the Medical Partner for the purpose of covering the cost of care for that specific person. In Watsi's case, however, sending money to the hospital is actually more efficient than sending money to the patient directly, because that's where the funds will ultimately end up. We talk more about operations in our FAQ: https://watsi.org/faq and in this blog post: http://bit.ly/Ynug55
>Do you believe that creating these individual-to-individual dependencies is a net positive improvement for society?
I believe systems like Watsi are the future of healthcare. There are roughly 200 countries in the world, and approximately 40 have functioning healthcare systems. In each of those 40 systems, healthcare is paid for by individuals, for individuals (either through taxation or insurance premiums). We're universalizing those same dynamics in a more transparent and accessible way.