One way to think about effective altruism is that it's trying to get you to apply whatever moral intuitions you would use in a concrete scenario to an abstract scenario. To any individual apart from it, it's abstract to know that mothers in some poor country can't adequately nourish their children, or that mosquito nets reduce malaria deaths, and so on. But, the reality is that those people are actually real, are actually suffering, and actually could be helped. If you take that message to heart then it won't make sense to send your charity to the community theater - by all means, send the theater money if you want, but it's a selfish thing, not an altruistic thing.
If there was a crypto trade available to make a billion dollars available for the next 15 minutes only - but you have to chose between the community theater, the bus of X people on fire or giving 10% of your gainz to a charity to save X*2 ...
You need to contextualize the life saved, do we mean they went to live one more day, or a full long life of prosperity and comfort with a happy painless death from old age.
And did they themselves gain the means to save more lives in turn?
For example, I feel giving people the means of saving their own life, or other people's lives a much more efficient way to save lives than actually saving a life.
And finally you have to address the sacrifices you've made and the people you've hurt in pursuit of saving that life.
To me, it looks like a charade, because the claim that you can actually measure and quantify all of these complex systems to truly arrive at the real impact of all these things, I just don't believe it. It seems you've picked a simple metric to measure, because it's easy, but is it lasting impact, is really more meaningful impact, that's all all still up in the air.