Simple answer. Buy the common for 6 bucks come conversion time and get a great deal on an ever growing player for years and years to come. This is my personal strategy, but i'm primarily an investor and a trader second.
As a pure profit minded trader i would take my gains and move on. This seems to be where you are coming from, and nothing wrong with that, its just that others here are actually wanting to get in on the new Wowjoint on the cheep, and thats where we see the real gains lurking into the future...
malc