Upload & Sell: Off
I spend way too much time editing images for my large prints. The few cents I would save with third party ink just isn't worth it. With OEM ink I am more confident bragging to clients about longevity of the print (on archival paper), I don't have to worry about inks going bad sitting in the printer too long, and I don't have to mess with refilling, etc.
Things I'm not willing to worry about, YMMV:
OEM ink carts have mylar bags inside that contract as ink is used. This keeps air away from the pigments. Third party carts are just empty shells that expose the ink to air. I have some OEM carts in my 3880 that area 3 years old and print perfectly and never clog.
OEM carts monitor the ink for you and never lets a channel run dry. Yes, this means a few MLs are left in the cart. Third party carts and inks require you to check each ink cart visually and keep track of ink volume. If a cart runs dry it can ruin the printer.
Many have reported that since third party inks don't have the bag inside to help pressurize the ink, performance becomes an issue as the carts are used up.
Since I'm not a high-volume printer the ink savings is just not enough to go away from the ease, convenience, and confidence OEM ink brings to the art print process.