The money makers for all theses stores is the 'Corporate Account Sales' and delivery.

When I was an Automotive Technology student (at 37 years old) going for VA required retraining, I set up the Carquest account for my local Community College that was being ripped off by NAPA. Everything but Brake and Clutch parts, 15% of sales, we had been ordering 85% directly from NAPA but for the same Carquest part it was 25% less. By switching to Carquest my college saved $25,000 in the first year. Yes the college was adding the 'LIST' price to all repair bills so the lower cost up front did add to the profit margin. All the profits went into a scholarship program.