Hi,
As someone who makes Custom Printer Profiles I stand to make more income from customers using non-OEM inks, as you absolutely need Custom profiles for them. However, I never recommend them and am usually disappointed when I see profiling targets printed with them!
It's often immediately visible to me that non-OEM inks are being used.
It's also usually apparent in the measurements of the D-max and in the final colour gamut, which is invariably smaller than genuine OEM.
Custom profiles help, but can't put back colour which was never there in the first place, if the ink is the wrong hue, saturation or intensity.
Do I use them in my 3880, never!
Cheers,
Phil