Flipping deck boards?

I have a PT wood deck and the decking boards are really starting to show their age; they're about 15 years old. I have been toying with the idea of of flipping the boards over to get a little more life out of them. I have looked at the underside and they look pretty good. The boards are applied diagonally and I will have some issues to resolve. First, for the end miters to be correct, I have to flip the boards end for end. That means that the old screw holes will be left open because they won't line up with the joists any more. Second, it seems to me there almost has to be a stain on the bottom side of the boards where they met the joists that would now be exposed. Third, I will need to add additional new boards where there are now splices because the old boards are spiced; I'm not too worried about that because I did replace a board once and it only took a year to weather out and blend in. Any thoughts? Am I being an idiot to even consider this?