LOL. It's not just at DE. From non-racers that stop by my paddock to look at my car, by far the #1 question I get is "how fast will it go". #2 is "do you have turbos" (usually very surprised when I say no), and #3 is "do you have nitrous".
People don't seem to get the whole car class thing, they see a 'fancy racecar' and assume you're allowed to do anything you want to do (it's a racecar, right?), and why would you NOT put turbos and nitrous on a racecar?
To be frank, I couldn't imagine bringing a Cup to a DE. I did DE's and instructed for many years before going racing. I did one DE about 2 years after I started racing, and it made me crazy having to hold up all the time and wait for pointbys, in the advanced/instructor group. And that was with a car 13 seconds a lap slower than my 997 Cup at the same track. That was one of the big reasons I went racing in the first place, and it totally reaffirmed it. Haven't done a DE since, I think that was 9 years ago.