For giggles I ran a simulation of these formulas on Fiel's diamond stockpile, assuming the goal was to maximize the number of high quality diamonds and sell them, and here's what came out in 5 runs of the simulation.
Basically as long as high grades retail for at least 3m you break even. anything above that is profit. I've heard guesses of up to 25m for them so I'd say a certain chinchilla is anticipating some heavy yields there as long as he has the income to afford this level of processing in the first place.
Edit* I forgot to mention, for those who don't see it, it's a significantly higher profit:expense ratio to only bother selling the appraised ones - Upgrading will earn you more, but it also takes more time and costs more, and isn't as big a return as the intiail appraisal, just an incremental boost because you lose so many. If those lower grades sell at all they may be worth more to sell than to try upgrading.
Edit2*Went back and repopulated the sample simulations after realizing half the formulas were hard coded to 3200 from beta testing. Oops. Real figures now.
Spoiler
Basically as long as high grades retail for at least 3m you break even. anything above that is profit. I've heard guesses of up to 25m for them so I'd say a certain chinchilla is anticipating some heavy yields there as long as he has the income to afford this level of processing in the first place.

Edit* I forgot to mention, for those who don't see it, it's a significantly higher profit:expense ratio to only bother selling the appraised ones - Upgrading will earn you more, but it also takes more time and costs more, and isn't as big a return as the intiail appraisal, just an incremental boost because you lose so many. If those lower grades sell at all they may be worth more to sell than to try upgrading.
Edit2*Went back and repopulated the sample simulations after realizing half the formulas were hard coded to 3200 from beta testing. Oops. Real figures now.
It's not having what you want - It's wanting what you've got.

