SpeedFan can report the speeds of each fan and it can even change their speed based on current temperatures. This lowers noise and improves computer experience. SpeedFan can access the voltages reported by the hardware. This can help to identify odd issues with computers resetting under stress, for example.
So while securables created by the database owner actually are owned by dbo, this is still the user that created them. Also, most objects are probably not created by the database owner itself, so this still does not explain why most securables end up with dbo as owner.
The name of the owner is omitted for any object for which you do not have Read Permissions access. To determine who owns a registry object, run Regedt32. Select the object in question, then choose Owner from the Security menu. The Owner dialog box displays the name of the object and the name of its owner.