Computers are my hobby, I wanted to try building a decently powered mITX PC and I had disposable income at the time to do so.I really don't get trying to build high-performance SFF computers for high-end gaming anyway. If your main objective is to enjoy high-end gaming on your big TV, why mess with all the heat/space/power constraints? Is a decent computer case too hideous to behold in the living room? C'mon!
If it matters that much to you, put a thin, gauzy tablecloth over it and set a vase/clock/porcelain statue on top. Voila! No "ugly" computer, just a pedestal for your art!
For games that truly require more processing power I can stream them from my main PC in the office to the living room.