Yeah unless you're making parts (and that's a whole other thing) you're operating on single digit margins. 2022 saw the most vertical integration i've seen in parts, distributors were buying up mfgs, then buying up software/eCommerce production companies to sell directly. If you want parts and it's not from CarID, RockAuto, Summit, Jeggs, or XDP, chances are it's now owned by one of a hanful of parts distributors wholly or in part.
I could spend all day talking about the economics of parts XD