Took the time to run through my invoices and memory and have come up with a pretty comprehensive list. I am glad I did this, because it somewhat confirmed my prediction that I was really overestimating my expenses.
In general, I've put 7.7k into the truck for recommended maintenance, repairs, paint, and a high-mile tune up (replace key gaskets, all hoses, etc. to prevent wear repairs) since the beginning of 2011, and about 2.2k in 2014 from 2 incidents. This does not include tires or oil changes, as there is nothing aftermarket about my tires and the oil changes are universal.
About 2.9-3k in mods since I started modding it in early 2013, list found in my build thread in my signature.
Even together, these costs are far less than a payment on a used NNBS, and arguably increase its value for enthusiasts/private buyers, despite decreasing its value to dealers.
All of that said, I regret starting at 5, and am taking down the listing, to probably relist between 8 and 10 and waiting for the right buyer.
My question to you experienced folks: Let's say things hit the fan down the road, and I need a new engine. Could this truck still sell even if it was towed to the buyer? Obviously not for 8, but for something.
Edit: $1,000 to a roof repaint, $100 for scratch fix ups, $50 towards some DIY leather repair, and my reminders of this truck's age are gone. But is it worth it?