It wasn't exactly heroic, but a hero's got to start from somewhere! While you didn't earn that much from cleaning the stable, it was at least a non-violent means of generating income - a good way for new heroes to get enough gold to buy some basic equipment. If I recall correctly, it also helped beef up some of your stats too as you were doing exercise.
This track is the music that plays when you're working hard in the stable. I believe this is the VGA version one though - I don't remember this many embellishments to the theme!