as your income goes up, you will find that buying multiples of things you like, and buying consumable products in bulk has a very high return on investment from a convenience and marginal cost savings point of view:

* device chargers for home, office, car, and backpack/briefcase

* several pairs of the shoes or sunglasses you really like

* bottled beverages and non-perishable snacks in bulk (JERKY!)

* cheaper versions of things you use at home, for when you're traveling (in case you lose them)

* multiple monitors for your workstation

etc.