It is permissible to receive remuneration on festivals to fill any permissible requirement for a mitzvah…all the more so for a laborer who hasn't what to eat unless he earns income…making benches for the synagogue to avoid arguments is a public need, and permitted, for they are physically necessary for people so that they may sit. They did so in Jerusalem, following Rabbi Mahadari Binyamin, to accommodate the guests who had no place to sit.