Participating in illegal activities does not make the coin more valuable but rather makes illegal transactions possible and criminalized the bit coin trade and hence soon it will become regulated.
Your first statement is flat out wrong. Illegality is actually a driver of prices in all sorts of activity. See drug prices now, alcohol during the Prohibition. (Also, and this is more of a style and culture matter, learn about run-on sentences. They're one of those things that got cut in us-landia colleges.)
Obviously, it is "not like a bank transfer". Then again, that you personally have never seen anything like it, makes no difference in its actual legitimacy or usefulness as a medium of transaction.
