ON spec class racing......
Hand-out motors are a good idea, however, earlier somebody posted that a track charged $25 a race??? That's a bit much.... with a little thought I can easily get the cost way down....
Start with a very good spec motor.... The Tamiya/Mabuchi 540.... they can be bought for $15.... number each one and hold a "lottery" for your motor before the first heat... Make the "season" 10 weeks with 2 throw-out weeks and make it a points series. at the end the top 3 drivers get a small reward and their choice of 1 motor..... and all you have to do is charge $2 more per race.....
With the mabuchi you don't have to limit batteries, and you can choose a set of spec tires for everyone to use..... and a set of tires should last for the entire 10 race season......
Oh and for each "season" make it a different body "class".... season 1 is trans-am, season 2 european exotics, 3 Japanese tuner cars.....ect....