Why not share an apartment? I had great (and bad, but also great) experiences with roommates between ages 19 and 28 (when my then girlfriend, now wife, moved in

Why not share an apartment? I had great (and bad, but also great) experiences with roommates between ages 19 and 28 (when my then girlfriend, now wife, moved in with me). I could (and intermittently have) afford to live in my own but the social benefits of roommates were worth it.