Toy developers long ago found sharp angles and pointy extrusions appeal to a hunter instinct, in constrast to soft and round features which appeal to a nuturing instinct. On average, young boys prefer predatory traits and young girls prefer nuturing traits. There are some good case studies in otherwise interesting toys that on first glance seemed to be great products but didn't gain market traction due to a failure to appeal to either a nurturing or predatory instinct.

Great article on the topic of Hunter-Nurter fixations in Universal Principles of Design[0]

Funnny enough, almost all the marketing I've seen for gaming computers has basically the same marketing principles as those for toys marketed to young boys.

[0]http://people.sunyit.edu/~lepres/thesis/principles/131_pdfsa...