I've always had similar thoughts. Watch a few Just a Printer videos and everything seems possible but I always have to remember that his print shop is VERY different from mine and alot of other more traditional "Business Printing" shops. From what I see the majority of his jobs are books, and I'm sure most of the those orders are fueled by the Bookshop/Distribution side of his operation. I really admire him and watch every video but I do feel it can give a false sense of a "standard" printshop.
Personally we have one V80 and an old DC242. Most of my jobs are usual business stationary, flyers, brochures, ncr books, memorial items, posters etc. I generally have my jobs out the door 24-48hrs after being ordered. I just couldn't operate with any down time in diagnosing, taking apart and waiting for machine parts. I ring Xerox and hours later they're here, need a part and following morning they're back with the part, sometimes they drive straight to the warehouse and return with the part same day. I feel the V80 has been good, has its flaws like any press, but overall I rarely need service. However I have had 1 or 2 instances in the past where large amounts of the machine had to be taken apart and numerous parts replaced, at the time I was thinking thank f%$k I have a service contract.
I also wonder how those without service contracts are managing the likes of the Xerox drum fiasco, I'd imagine alot of wasted hours convincing them of refunds and returns.