Especially after they are out of school (where it's easy to meet vast numbers of singles.) Once you have a real world job, it's almost impossible to find people. You won't meet anyone through work, most likely, and if there were anyone suitable in your church/bible-study/social circle, you'd have paired off with them long ago and the issue would be moot... If that doesn't happen, then...
dating is the only option for guys and girls left out of the "social pipeline", unless they just happen to meet someone
I can't convince courtship advocates of this. Heaven knows I've tried.
I rarely see any women within the age range of 21-30, of whom is single and or willing to date. The only time that this occurs is when I'm jogging on a nearby trail, or when I attend the Christian Singles Praise & Worship, of which I have spoken.
There are a few single women at my church, but they rarely seem interested. I had one girl at my church, of whom I really liked (for years), and she would play games with my head and tease me (get me to think that she liked me in a dating sense) so that I would later ask her out. Upon doing that, she'd say something to the effect of, "As friends, or...", or she'd make up an excuse of always being busy.