The dollar is still worth 4 shekels according to the Gedolim

The dollar hasn't been anywhere near the 4 shekel mark in a very long time but Areivim is still insisting on pricing in dollars at 4 shekel to the dollar. This month they will be collecting $5.6 at 4 shekel to the dollar. This obsession with the dollar is really strange, why they can't just say they are collection 22.4 shekel is beyond me.