Gameboy powered by 1936-38 Jensen steam engine: Why?

Here is a video of some guy using a 1936-38 Jensen steam engine to power his Gameboy. Oh just to let you know, the flywheels used is from a later model. The steam engine then runs a small generator which produces 3V DV; this is enough to power the Nintendo Gameboy.

What I do not understand is why any one would want to run their Gameboy on such a noisy and bulky piece of equipment. However I have been told that a number of people run their Gameboy by steam, we live in a strange world.