I don't know... it's just... When you buy furniture you tell yourself: "That's it. That's the last sofa I'm gonna need. Whatever else happens, I've got that sofa problem handled." -- The Narrator, Fight Club.
I've never actually owned a sofa before. My first apartment came with furniture, including an old, worn, fold-out sofa-bed that was incredibly uncomfortable to sit on, and threatened to swallow you into the gap between its cushions at any moment. For my second apartment, I borrowed a couch from my mother, which I had to return when I left Western Australia. My first apartment in Sydney was too small for a couch: the only comfortable vantage-point for watching TV was the bed.
I have the feeling that 28 is perhaps a little too old to be buying one's first couch.