When it comes to creating a new habit, we all know itâs easier said than done. But what about a habit that rewards you with cash? Yep, thatâs what 16 Weeks of Sell is all about. Sell one item every week for 16 weeks and not only get yourself a beefier wallet â youâll also build a lasting habit of selling things you no longer use. A win for you, and for the climate.