I've tried using it a couple times but I've only succeeded once and only got 18 collectability over the rarity



One response here on reddit says they only got 10 over. Either way, the reduction to 10% gather rate is incredibly steep for such a marginal gain.

If something has messed up (either human error or you were relying on impulsive appraisal) and you are just beneath the threshold by 10+, then it may be worth it to use last ditch as literally a last ditch attempt, but don't expect anything at 10% success rate.