US purchases are allowed. MEDX is not a security. It is a utility token for real healthcare services. Token sale participants will have early access to the platform. For various other reasons which will be documented prior to the token sale, MEDX does not pass the test for common enterprise (i.e. It is not a security).
So how do I make money from buying into MEDX? I have insurance which costs me nothing to see a doctor, but it costs me money to see a doctor on MEDX? So what is the incentive for me? I am an investor and I want to make money. I don't want to pay money so I can have early access to the platform (for what? so I can see a doctor sooner? ). Do I make money for having early access to the platform?