Unfortunately, There's a lot of this dropping down (sandbagging) that goes on. I think it's total crap! You shouldn't have guys in the C class who can finish in the Top 40 Overall. The only riders that are allowed to drop down are local AA to the A class. That's it! If you ride B in your local series, you're supposed to ride B.
I rode the opening round at Ock. Fla two years ago. At the sign up for the C race, they were anouncing that they had a list of all SETRA and FTR B riders for both Hare Scrambles and Enduros. If you signed up for C and the found your name on one of those lists, they said that they would turn you into the AMA and you could have your AMA card suspended for a year.
They should be doing this at every race. However, they have a lot of other things to deal with without trying to focus on people signing up for the wrong class.
The proper way to do it is to ride 2 races in the class that you belong in and if you aren't competitive, you petetion the GNCC to move you down a class based on lap times and finishing positions. Here's the class rules from the GNCC site:
RIDER ELIGIBILITY AND CLASSIFICATION
Pro Classification
1. Top ten overall riders from previous year's GNCC series, unless eligible for age class. This applies to Motorcycles and ATVs.
2. Top ten AA AMA National Hare Scrambles riders.
3. Top ten overall riders from the AMA National Enduro, Reliability Enduro, and Hare & Hound Series from the previous year. All current AMA Professional license holders from all types of Off-Road Competition.
4. All international riders that currently hold a top ten ranking in their home country's National Championship of similar type of event.
5. All riders from the previous year that were chosen members of the World ISDE Trophy Team.
6. All riders from the previous year that earned Gold Metals at the ISDE.
7. Any rider holding an AMA Pro Sport license who qualified for an Outdoor National Motocross or Supercross in the current or previous year.
A Classification
1. All riders in the top ten overall ranking in any regional or state Hare Scramble Series sanctioned by the AMA.
2. All B riders ranked in the top three of their class in the previous year's GNCC series. They must have won at least four races during the previous year. Age divisions are explained below. For 2002, the top ranked rider must advance to A.
3. All riders that have ever qualified for the ISDE.
4. All riders that have an A ranking in any other off-road series.
5. Age Divisions - B riders winning four or more races during the season must move to A division the following season.
B Classification
1. All riders wishing to enter an event that do not qualify for the C class and also do not meet the qualifications for placement in the A and Pro classes.
2. All C riders ranked in the top five of their class in the previous year's GNCC series.
3. All riders that have a B ranking in any other off-road series.
4. If a B rider places in the top twenty overall at any given event, they will be moved to the A class the following event.
C Classification
Novice riders not ranked in the top five of their class in any other off-road series.
Moving within Classifications
A rider may not move from an upper classification back to a lower classification if they have participated in more than two events in the upper classification during the season. A rider may request to move back to a lower classification based on class finishes and time differences.