Without run data from every jet car exhibition driver that question is impossible to answer. I would suspect that those who are being paid to run at an event as the brought in exhibition 'act' may have chanced their arm to make a run and receive their money. For record attempts I have observed return runs made with less than ideal conditions.
Good feature on Stay Gold in the current Autocar-
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'I am not what is called a "civilized man", Professor. I have done with society for reasons that seem good to me.'