Comment on Giving isn’t demanding* by Matt Sharp
Practical Ethics - about 5 years
"Second, the latest psychological research suggests that, despite what you may think, income level really doesn’t make much of a difference to your overall happiness."
"When plotted against log income, life evaluation rises steadily. Emotional well-being also rises with log income, but there is no further progress beyond an annual income of ~$75,000. Low income exacerbates the emotional pain associated with such misfortunes as divorce, ill health, and being alone." http://www.pnas.org/content/107/38/16489.full
Though as you say "Desiring money because of this pleasure it gives us is often mistaken – there are better ways of getting pleasure. "
Still, I fully support greater redistribution of wealth; as well as greater creation of wealth. The Schistosomiasis Control Initiative website that you link to supports the latter, given the effects of the disease on schooling and cognitive development. And it’s also a very cost-effective treatment.
Practical Ethics article