The expected number of eggs lost is least if you choose the best basket and put all your eggs in it, but because of diminishing returns, you’re better off sacrificing a few eggs to reduce the variance. However, your charitable donations are such a drop in the ocean that the utility curve is locally pretty much flat, so you just optimise for maximum expected gain.
Specifically on this topic.
The expected number of eggs lost is least if you choose the best basket and put all your eggs in it, but because of diminishing returns, you’re better off sacrificing a few eggs to reduce the variance. However, your charitable donations are such a drop in the ocean that the utility curve is locally pretty much flat, so you just optimise for maximum expected gain.