The only problem that might arise with your numbers is if they don't assign them to you. At a number of SVTOA events we assign numbers according to run groups and instructors. Ie: Run Group 1 is 101, Run Group 2 is 201 and the Instuctor for those students is 401 or 501 depending on the number of run groups. It makes it easier for students to remember their run group and be able to find their instructor's cars.
I don't blame you on the money issue. SVTOA was not allowed to set the price since it would have been less than what SAAC normally gets for its glorified parade laps.