Primecoin rise looks as a big pump and dump action for me. Very likely, we will see a big dump in the next days.
Today it's had a $342,952 volume and a 7% increase in price. The other day it had over half a million dollars volume and only went slightly double it's starting price for the day. During the last month it's only up 4x after all the money thrown at it. There are other altcoins that got pumped 100x over the last week. It's strange that Primecoin hasn't gone higher.