I would imagine that if such a decision was made - it'll likely be women and children first (I like when my gender suits me). Alternatively, they would leave the fittest people behind and take away the ones most in need - also likely children and less fit/healthy/sick....I'd be okay waiting for the helicopter to go back to base and come back. It makes no sense that it wouldn't be able to do that at all. If others were leaving, I'd be left with their food and supplies. Alternatively, if the helicopter couldn't take me and a few others, rescuers would have the good sense to drop off food and water packets and blankets or thermal packages to help us survive until the next trip.
The idea of being allowed to get on the ladder and then cut yourself off is just foolish. Just stay back, as advised.
Sorry - sacrifice without real meaning or need is not honorable to me, it's foolishness, best saved for martyr films that I will ignore during my walk down the video store aisle. That's not how I'd like to LIVE or be remembered. I'd rather come up with a really innovative way to get everyone out, extend the ladder/strengthen it or survive for the days needed until the next pick-up.