Profitability ?

I have been a NEA holder since they were Ipernica. I sold half of my holdings the last time they hit 80c. They are getting close to that price again and I am wondering where to from here as punters are buying plenty of blue sky at current prices. The investment in the US has been substantial and its not showing an acceptable return yet. The US business is being carried by the Australian operation. The irony of this is that NEA's share price would be much higher if they did not commence operations in the US. The US has potential but I am not sure about the ability to make an acceptable profit in the US to justify the share price. I am also concerned with the potential of another Capital raising as it came out of nowhere last time.
Any thoughts ?