After he levels up a bit if the destroyed item has a skill attached, he seems to permanently add that skill to a list he can add to other items, and he can tell what skills are attached before destroying the item (which no one else can). The MC starts looking for items with decent skills to add to his repertoire, which he can haggle on since no one else can determine the skills attached to items, and non divine treasure weapons are generally treated as ornaments not weapons
though he even ends up having to but a pair of black panties from a woman’s apparel shop because when a coworker dragged him in he notice a special skill on that one pair. He basically buys it on with that name it has to be good (it is) and no idea what the skill does but it is not one you would like for someone to accidentally trigger while wearing them.
Though there is not enough growth or variety in skill ranks for me, too many skills are just rank S from the start. But there is growth in how much he can place on weapons.