For me I would not put a cent more, I am holding more than enough of this stock (around 50% of my portfolio). There are blue chips doing better and some dividend paying ones. BUT I am riding this out till the end, it seems prudent to me to jump out after 2+ years of waiting. what's another 6+ months? (I REALLY HOPE that's all!)

diversify! I would not dump everything into one basket hoping for a payday, I already put half my basket in there! my other non stock investments are doing much better than this, which is good to have so the other half isn't fully on your back asking what the heck are you doing with our money. :)