And for those who want a reason, here's a pretty one I completely made up myself and is in no way confirmed or condoned by admin (hell, I might even get my behind kicked) but to inform the masses and keep them happy, here it is:
As you know, you can create energy through movement. Our energy was supplied by hamsters running around in huge wheels.
Unfortunately, rats started eating all the hamsterfood. To control the rats problem, we hired some cats to get rid of the rats. Due to a small miscalculation, the cats decided to go for the easier prey, the hamsters. On top of that, Atlas' leash broke, and he ate the cats. So we had no hamsters, no cats, an Atlas with a belly ache and a load of rats.
Thankfully, admin figured out rats like to run around in wheels too, so the problem is solved.