I actually just assumed the title was talking about mail services, in which case I can see some truth, though it is probably a corollary to the actual facts. I

I actually just assumed the title was talking about mail services, in which case I can see some truth, though it is probably a corollary to the actual facts. I think people who are more technologically-inclined are using Gmail. It offers a lot of obvious advantages to a power email user over Yahoo! Mail. I have also noticed that those who are technologically inclined are often slightly more affluent than those who are not, perhaps due to in-demand skillsets causing jumps in pay rates versus other jobs. So maybe the money is sort of a side effect of technological knowledge. Just my .02.