פירוש על קידושין 63:2

What difference does it make to him (lit. what comes out from him): What loss of money is there [for] him.

A baraita that we saw earlier seems to say that a person must honor his parents at personal cost. But what personal cost can there be if the parent pays for his own upkeep? The answer is personal loss of work time. If one needs to help one’s parents and by doing so he will lose time at work, he must nevertheless do so.