Not nearly every "gaming PC" is used for only that.

When I grew up, I had one PC to do everything: Homework, gaming, learning to program, storing the single copy of treasured family photos, gaining painful experience in why to make backups before modifying the MBR to dual-boot Linux...

Especially with iPads and Chromebooks becoming more prevalent in an education context, a "gaming PC" might well be the only computer that gives the user full control over it that many children have access to these days.