Let me ask you this question GT8 so that you can work out why its better for the SP to be 1.5c and not 0.5c.
If or when they show their cards, if it increases the SP by 1c, would you rather be moving off 0.5c or 1.5c if your average is say 1.7c?
If you are a holder, there is no situation that I can think of where a lower SP is better than a higher SP.
