Milhouse, many many many people davka use a learned baal halacha rov that know choshem=n mishpat well, that HE should do the mechiras chometz because of the complexities of a goy making a kinyan on metaltalin and karka (renting places of chometz). They davka go to a posek and dayan. They expect HIM to be at the mechira and not delegate the mechira to some clerk.
Indeed, the “pulpit rabbis” that give great drashos but know little of choshen mishpat, they NEED to get help from real rabbonim to make a proper mechira – and therefore delegate the real rabbonim such as those on Vaad or sitting on Bais Din.
I personally take care of the gashmiyus of my household, including the appointment of rov to sell the chometz. I choose a rov that I know is bokee in hilchos kinyanim especially for goyim.
How it works in “the real world” depends on which world – the world of aam haaratzim or the torah world that knows the issues. In the world of aam haaratzim, they appoint their “rabbi” who will later appoint a real rov. In the torah world, we go and appoint a proper rov and want HIM davka to do the mechira.
Is this really such a chiddush?
.