A lot of people, myself included, were very uncomfortable about making their CDing "real" with a FTF encounter. It took me quite a few PMs and texts to develop the comfort level needed to take that step.
Now, I like to think of myself as a reliable person. If I say I'm going to meet with someone I will show up. However, if someone pushes me to do something before I am ready I will say "no." Someone with a bit less self-confidence might find it easier to say "yes" and then just not show up.