Mike ... I fully agree with you. A spare is just that, a spare. Look at the spares in most vehicles nowdays ... the most minimum piece of rubber you can call a tire. There's a good chance your spare will never be wound down from it's carrier. I'll argue about saying five 614's already gives you another tire in case of puncture ... you'll still have to pay for two off and two on as the spare wheel is steel for those of us who have aluminum rims.
It all boils down to peace of mind of the owner ... If I were to
ever go with 614's, I'd save that extra $300 for spinners for my hub caps or maybe yet another LED yard ornament for my campsite setup