You know what they say: "If you want someone to love you, get a dog."
I can barely keep up with the amount of time and emotional energy my two dogs require. I doubt I could cope with that in a human, and have to converse with them too.
The big drawback to being alone is that it's expensive. It's not so much that I want to be a couple, I've always found the notion of a couple faintly repugnant, but when I was younger I used to want what couples could afford, like trips overseas, getting a mortgage, a decent car etc. I suppose you have to make the compromise and be a two-headed monster to get that stuff.
There's a song on the radio at the moment here, it goes "You couples look ugly when you're alone, but together you're beautiful". I sort of understand that notion.