Just walk away.
It annoyed me too but they can't simply be silent or the place would feel empty and not lively as the market place should and they can't have infinite voice line either.
So go in a quiet place like you would do in real life. You don't think about strategy in a crowded noisy place.
I actually like that kind of immersion.
I dont complain on amount of voices on market, I actually also like how crowded it sounds, but with it that fast constantly repeating same words that fast (Cyseal Cyseal shiver me timbers and slither me eels!) that really can sometimes be silly (Cyseal Cyseal shiver me timbers and slither me eels!).
My whole idea is ok leave same words and all (Cyseal Cyseal shiver me timbers and slither me eels!) just dont repeat em that fast.
Crowded markets and barracks and all places with loads of sounds do sound really fun but just sometimes when you cant move that instant away or simply doing invs and stats it is not most pleasant.
I just want to point it out as one of those not so big things, but one of those things that can ruin immersion.
Cyseal Cyseal shiver me timbers and slither me eels!