Not much else to say about this. The study conducted by MocoSpace found gender and time spent playing to be somewhat equal. But:

However, it’s the virtual goods sales that show a major difference. 69 percent of men buy virtual goods, while only 31 percent of women do. In fact, MocoSpace found that 90 percent of virtual goods sold-in game are bought by men. [Examples of such MocoSpace games include Moonbase, Crime City, Stage Hero, Happy Farm, and Street Wars.]

Read the rest here.