If you teach them how to fix it it should come in correctly after the first time. In theory at least, ymmv...
As far as I experienced, this kind of behaviour can have 2 responses:
- the guys who strongly believe that they know their job... those will stone-wall you with an answer like: "I do this job since 30 years and I know how to do it" or "I work with 50 other printers and I have no problem with them" or, the worst, "If you are not able to print my files, I will give them to another printer more competent"...
And generally you loose the customer. Meaning that to save the 2 or 3 hours needed to fix each job (I don't know the price of the labour in the US, but it's certainly no more than 200 bucks), you take the risk of loosing a 10 grand job.
- the guys who know that they don't know, and want to learn... those are time-consuming and you will spend hours and hours to teach them how to do the job, not being completely sure that they really understand what you taught them (which sometimes results in mistakes being worst than before the teaching), for a one color 4-pages A4 leaflet that comes 4 times a year and takes you half an hour to fix...
And after 3 leaflets the guy is fed up with this job he did pro-bono and a new guy takes over... meaning that you have to re-train the new guy each time.
If you do the maths, you'll see that "loosing" time to fix the customers' files to make them just printable is the less expensive way to work in a printshop and the best way to keep the customers.