I agree with Tipster that for certain coin the moon only appear at some stage of the coin's life, once missed never to return again. I hold some xspec @ US$2.50 when it went up to 6.00 plus I didn't take profit and eventually have to cut painfully loss at 1.00. After this painful lesson,my conclusion is only  good coins with very sound fundamentals worth holding and even then I would definitely take profit when their prices reach exorbitant level.