I don't even mind the "thrown out of the household for being useless" plot, but can authors at fucking least do it with more creativity than "huh, we never heard of this particular skill. Sure we have no idea what it might actually do, but we are not going to spend absolutely any effort in trying to figure that out before discarding the holder as if it was yesterday's trash".
Seriously, for all that's sane, at least spend a few days, or even a few hours, to see what the skill actually do.