i was talking to my dad about the exact same issue last weekend. i have been encouraging him to take the school, but sensed some reluctance on his part. the name of the school, and the assumption that many (if not all) of our students are racers, or at least extremely fast, and that the "mortal" street rider who doesn't normally push the limits too much will be a hindrance on the track, has not been my eperience.
our students range from extremely fast riders and racers to much slower street riders, and our methods for teaching, drills, and very well executed course control, keep everyone happy together on the track.
as an ex-racer, i had wondered how well it would work (before i took the school as a student), and was happily suprised with my ability to ride at my pace without spooking any slower riders (as long as i followed the rules and course control guidelines). the students i have had that were more sedate street riders at heart have all had a great time on the track, and have been able to co-exist with others of other speeds and skills on the track.
many many riders (if not the majority) seem to show up with the same goals as you, to become better riders, and not necessarily just go "faster", so you should fit right in!