On Passover, we are required to eat a substantial amount of ritually designated food, and also a proper holiday level meal. This is the obligation of a "seder". Two nights of this (in the diaspora) is fine. Throw in a Tu b'Shvat seder and I can still fit in my pants.
But I found that in Israel, and even outside, many yeshivot have a night seder MOST EVERY NIGHT! And add to that there are books about, lectures about and the Israeli government and others even have codified what one needs for a "Seder Hayom" -- EVERY DAY!
Ignoring the amount of time required to prepare and hold a proper seder, and the monetary investment, I am wondering about the calorie intake demanded. Have any commentators explained why it is essential that we have so many ritual meals throughout the year?