Huh? I think you are trying to make the point that her being busy is a valid reason to not see her. Fair enough... I just plan ahead some and problem solved. The alternative is that I go to an unknown girl and may or may not have a good session. I LOVE seeing this girl, so booking ahead is a small price to pay. Plus the anticipation makes it even better since we typically chat on PM/Twitter leading up the appointment.
I guess it depends what you want. I agree that there is fun in discovering a new gem. Sometimes, I like my comfort food.
BTW, the expression is "Case IN point"...