Likely because they're only fantasists, or married, with no intention of meeting anyone. This happens to us all at one time or another.
On this subject, many women set up meetings at a munch or play party so they aren't wasting their time if the person doesn't show. They have their activities already planned and if the person turns up, it's a bonus. You could also put aside half an hour on a day you're doing errands, if he's a no show you still have things to do while you're out and the day isn't a waste.
In order for you to insult me, I would first have to value your opinion.
I love it when someone insults me. That means I don't have to be nice anymore.