Because I simply considered to go the other way around, I do not high speed and something collecting dust because it will be on for 15 minutes and doing nothing at all the rest of the time and taking quite some room.
That what I like in the simplicity of a Single Board Computer, it doesn't eat a crazy amount of energy, it is dead silent and it is very discreet.
I really do not need a powerhouse machine. Actually I always aimed at low power CPUs (I used an Atom 270 until its PSU and fan failed).
The simpler the better.