I used to have a light rivalry with one of my friend. We both started with 10 gallons back in high school and got quickly bored. We would drive around LFS every week end and look for cool new fishes. We got bored of our 10 gallons and upgraded to 55 gallons tanks from Walmart. He got a 6-7 inch silver arowana and I refused to get one, knowing how big these guys could grow. I was always switching between oscars, flowerhorns and cichlids instead. I remember he once told me why I kept "bluegills" in my tank when I had a paratilapia polleni in it while he had a "dragon descendant" in his. We both wanted to upgrade our tanks to bigger ones but we couldn't afford new tank setups. We were still around 20 and lived with our parents. I got a 240 gallons off Craigslist but my friend's parents would not let him have anything bigger than his 55g and he decided to stick with it. He kinda ignore my tank when coming over and we stopped shopping around. I was able to raise a few "rare" fishes here in CA but all my friend could say was "That's some cool fishes. I'm thinking about going saltwater. Forget freshwater".
To speed things up, his saltwater tank dream was short-lived after too many failed attempts trying to set up a reef-tank. He tried to lead me into competing with him and going into saltwater with this argument: "Dude, it's easier to setup a saltwater tank with your big tank". Seeing all the trouble he had, I never thought about switching to saltwater. Monster Keeper for life.