I care for a couple reasons.
1. The astronomical cost of running a race car these days, fuel or otherwise, is limiting the number of people who are willing or able to compete on a regular basis. Like I said, it's not just the fuel cars - ask a comp guy what he's spending on an annual basis. So, if it limits the number of people who are willing or able to compete, it ultimately hurts the show I'm paying my hard earned money to see. The example of seeing 22 Funny Cars competing for 16 starting positions is a good one - regardless of how many cars per team. The more cars, the more competition, the better product for the fans.
2. If the cost of racing continues to sky rocket, so will the cost of the tickets I purchase to see an event. That has a direct impact on me, the fan - so yes, I care.
This is why I care. You may disagree, and you're entitled to do that but I believe I answered your questions directly.
What he said. And as a fan of this sport and a person who actively participates in it, I dont see how you cant be concerned about the cost.