A dispute between Beit Hillel and Beit Shammai: what do you do with the coins that exceed the value of the machatzit ha-shekel? Is the extra considered consecrated, or I it extra that can be used for anything? Consider the comparison between machatzit ha-shekel and a korban chatat - and the contrast between the fixed sum of the former and the variable value of the latter. Also, the ability the swap smaller coins in bulk for large coins of greater value. Also note how careful everyone was and needed to be with Temple property. Plus: The orthography of the Yerushalmi. Also, other areas of surplus, when money is set aside for a designated purpose, is considered a nedavah, a voluntary gift, as it were, within certain parameters. Including: lo and behold, including with regard to the Korban Pesach. Recall how a Korban Pesach can change to a korban shelamim. Note that the discussion about the 14th of Nisan was for the daf of the 14th of Nisan! And look at the interplay of the Yerushalmi here, on the Bavli of Pesachim, as it were.