i think for the most part it goes hand in hand with getting an ATV or a mini-dirt bike for the race track.
just something to get you around.
i know when i go to the track to watch the 1/4 runs i get sick of walking back and forth from the stands to the pits, to my car, etc. etc, etc
that's why a lot of people who race every weekend get an ATV, or scooter. i think those 49cc Sport Bike style ones kick MAJOR ass. they're expensive though. $2k. around there
*edit* nevermind, i was misinformed. i just found this one for like $600
ghost