Is "not buying anything" too vague?
I/we generally don't buy/own a house (instead, cheap rent apartment in good neighbourhood), car (bike/transit), resto food (cook at home), beef (pork/chicken/veg), soap and shampoo (big Muji brush), expensive clothes (thrift stores, costco), posh groceries (No Frills, Chinatown), haircuts (DIY), financial advisors (DIY, Questrade), books and recorded music (library), expensive plane tix (discount airlines, aeroplan points, train and bus) and hotel rooms (airbnb, points), new musical equipment (Kijiji), or cosmetics (DIY, do without, need less once you stop drenching yourself with soaps and shampoos!).
We do sometimes make up for this with lots of trips and the occasional holy crap expensive meal and drinks out...