Please do be careful and monitor the condition of your chain if you're going to deliberately let it degrade. You can cause yourself quite a nasty accident when your chain snaps, or even slips on the teeth at an unfortunate moment. I'd personally find a different way to increase the effort e.g. carry more mass
Not to mention that a broken chain means an inoperable bike, and replacing a chain on the go is a messy job. And if the chainrings are worn due to a poorly maintained chain, a replacement new chain may not even fit correctly.
So, even without injury, a broken chain even two miles away from town and a bike shop is no fun.
