You just answered your own question. The endgame, when building a storefront route, is to have every single job in a block or plaza (if possible). If you have multiple jobs in one tight area then you are not wasting time driving between work. You can afford to have slightly lower prices because of the volume and concentration of work.
You are viewing this as “What is the value of this job” when the real question that route guys ask is “What is the value of this block/plaza” You have to view each job as an opportunity to get the other jobs.