R. Joseph Koidanover (d. 1915) once asked why when a rebbe visits a town you do not recite the tahnun prayer. {?} He answered: “Just as at a circumcision you do not recite tahnun because there is a monetary loss (hisaron kis) – a piece is removed – so too when I arrive in a town there is also a monetary loss – nobody has any money.”
I.F.
M. Ivenski