This brings to mind the dollar-coin-frequent-flyer-miles scam a few years ago. Where basically, the US treasury started making dollar coins and no one used them. To encourage their circulation, they would sell boxes of coins online with free shipping. Munchkins started buying them with credit cards that gave frequent flier miles, then would deposit the coins at their bank and pay off the credit card. Result: millions of frequent flier miles for free.
The US treasury no longer accepts credit cards for online dollar coin purchases.
Where's the scam in this story?
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.