The public storage unit business is lucrative. According to Tom Vanderbilt of Slate Magazine, one in eleven households rents a storage unit and the storage unit industry claims a 90 percenty occupancy of its units. The industry even has an association magazine.
Granted, a storage unit can come in handy when moving or in between homes, but when the cost of storing your stuff exceeds the value of said stuff, you have a problem.
A storage unit is convenient in that you can put all the material possessions, the unwanted Christmas presents, the furniture from college, the winter jackets, paperwork and boxes full of who knows what behind a locked door away from your immediate area. Out of sight, out of mind. However, out of sight, but not out of your wallet. The average cost of a storage shed is between $50 and $100 a month. The average time in a unit is 15 months. I know some people who stick around for 3 or more years. Do the math.
Store is a bad word. Severely question anything you feel you need to store. Do you just want it out of your sight, but can't bare to part with it? Leave it around and out of storage for a while, if you still want it out of your sight, you don't love it and it should not be part of your life. Period.