The financial aid piece definitely makes sense. Even better though: write a little note, via e-mail, saying that you are still interested in the school. This is what was told to us when I interviewed back in January as a strategy for "wiggling" your way off the waitlist. I sent a note sometime in early March, Mr. Nesmith responded with "Noted", but then I pulled out a couple of weeks ago. Also, update your file with any honors, new grades, etc.
Best,
H&T