I paid $7k for it almost 2 years ago and am selling it today for $7500. So I will make $500 after putting 30k miles on it since purchased. So the fuel and tax savings are in addition to that.
A gas truck would not have made a profit at resale.
I bought it to run biodiesel, thats why I bought a diesel in the first place. As I said before, if there was a 1/2 ton option, I would have gone that route. I also said I am building a 1/2 ton diesel because one does not exist in the wild. The truck I will build will fit my needs AND get better mileage AND run on alternative fuels.
I bought the 7.3 because it runs B99 without modification and they are known to go 300k+. The fact it came in a 1 ton package was a drawback, but the pros still outweigh the cons.
well then i stand corrected.

you got great use out of your 7.3, are making money off the resale, and i'm sure the next owner will get many miles out of it as well. i've seen the 7.3 over 500kmi. down here in texas, 25k/yr is average; for a work truck, 100k/yr is not uncommon.
the 12v cummins and 7.3 Intl/PSD are notorious for bulletproof longevity.
keep us updated on your 1/2 ton build. i'm intrigued!