I'm not 100% sure how you meant that, and it seems likely that the person you talked to wasn't, either.

1. I was thinking you might have meant it as a joke, something like this:

Not actually posted by ruby2011:
oooooooooooooooooooooooooooooooooooo
Hey, if you had any idea how cool and interesting I am and
how much your therapists could learn by working with me,
you'd bounce two plain old boring everyday clients
to make room for me!

oooooooooooooooooooooooooooooooooooo

2. If, on the other hand, the person you talked to thought you were completely serious, she could very well have left a note on the cancellation list that you sounded like a potentially difficult client. Instead of getting assigned to the first therapist who happened to have an opening, you might need to wait for some grizzled veteran who was prepared to crack the whip (figuratively speaking), spell out the rules to you in excruciating detail, and make sure you didn't get away with a thing.

The upside of (2.) could be* that you gave them fair warning and now they know better than to, say, assign you to an intern. The downside could be that they decide they have few or no therapists who are prepared to meet your needs, so you get to wait longer for someone to become available.

*I did say "could be". Of course I have no idea how they actually interpreted what you said, what their procedures are, or what they're prepared to do with whatever they may have decided about you.