I don't know of any...and I think the main reasons are the negative perception the car creates among employees and customers alike. I'll explain:
1. Employee at "Joe's Auto Body" sees a stack of brand new alum wheels stacked up in the corner and grumbles to a co-worker "There's 2 grand worth of wheels sitting there for that friggin' race car, but I can't get a $1.00 an hour raise. XXX Auto Body around the corner is looking for experienced help, I'm headed over there right after work!"
2. Customer picks up his car after a brake job and gets a bill for a thousand bucks. He sees the car in one of the bays and thinks "I guess this guy needed some new tires for the race this weekend"...goes home and 45 mins later there's a bad review on Yelp..
3. Customer calls to see if his car is ready. He's told no, we haven't gotten it in yet. He knows there's a race car in one of the bays...hmmm..
And on the other hand...
You're at the shop working on the car after hours...doors are closed, lights are out except for the shop area. You've got the engine apart trying to fix something so you can race tomorrow night. Invariably someone walks in asking you to fix a flat he got "right down the street". Do you stop and be a nice guy for 10 bux for plugging a tire? Or do you say "sorry, we're closed" because you know you need all the time you can get after working all day to fix the race car?
Easier to keep the car at home in the shop behind the house. Family is there, all the perks of being home, plus there's little to no poor perception the car can create.