There are a couple of comments about it here, but I think this point in the paper deserves emphasis: they say that "well-being rises with income" in the sense t

There are a couple of comments about it here, but I think this point in the paper deserves emphasis: they say that "well-being rises with income" in the sense that well-being increases linearly with the logarithm of income past $75,000. The logarithm they use seems to be base 2 in Figure 1, so that means a person making $500k is roughly 17% happier than a person making $75k. 20% isn't nothing, but it's not much either. Especially since I think a lot of people in tech can get to ~$100k with a lot less effort than ~$500k.