is it really? the bone market is a shit of piece with a trash Issac, and "buying eyeless skulls at the rat market and then turning them into these" seems actively unprofitable if the 3500 skeleton value number shown above is correct. i could maybe see these as part of an "antiquity bomb" that nets a decent echoes-per-exhaustion ratio for the amount of effort invested, but only if one discounts the effort involved in actually getting these.