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Frankly who cares? If someone wants to signal, then fine we can work with that. Life saving is an archetypal signal of heroism. Start a trend of wearing necklaces with one bead for each life you saved to remind everyone of the significance of each life and to remind you that you've given back to this world. That would be pretty bad ass, I'd wear it. Imagine you feel sad, then look down and remember you've added more QALYs to this world than your entire natural lifespan, that you've added centuries of smiles. Perhaps too blatant a boast for most people's tastes?
Point is, even if it was all signalling, you could boast more if you knew how to get qalys efficiently. (I saved 2 lives sounds way better than i spent 10000 dollars)
If people are actually interested in signaling to their social circle, they will ignore geeky Givewell and do a charity walk for a local (for-profit) hospital instead.
I would consider anyone who would do this (based on the dollar amount of donation) to be terribly pretentious and, frankly, silly.