I'm not a mechanic, but at one of my businesses, I have gotten away with buying gearwrench over any of the tool trucks. I can see where immediate warranty service is a plus, but I find a quick trip to Home Depot can temporarily replace something till I can get it taken care of. I can't see spending 4 or 5 figures on sockets, but I know some diagnostic, and/or specialized equipment you can't avoid paying for.