well SSJBen sort of answered what i wanted to answer

those MP focused games have to be avoid using as examples, as theyre never meant for "high end graphics" anyway, they dont cater to that
even with my Skyrim with 4K res texture pack, even if its filled with bucket full of other graphical mods, it barely taxes 3GB VRAM cards. and it still look superb as well. their stock one was nasty as fuk btw, 128x128 reso max

and then suddenly Shadow Of Mordor comes in with Ultra Texture DLC, i tried it. and game keep crashing due to insufficient memory (GPU-Z shows maxing at 3+GB VRAM and being throttled by that)
and then visual checking time, i see no discernible differences (granted i only downsample from 2880x1620p) as their High settings is plenty superb already
the trend of constantly spamming uncompressed textures just because "muh next gen" is getting out of hand these days. Watchdogs look like crap. yet requires >3GB VRAM. what? how???
if this trend continues just cause "marketing tactic of more is better", GPU manufacturers cannot catch up as 8GB GDDR5 are not cheap and easily to mass produced yet (theres a reason workstation cards with 12GB VRAM are obnoxiously priced)
in short, i like how the direction the market is going, but only if the higher VRAM is to be utilised efficiently.
Workstation card's VRAM is expensive because it's based on ECC RAM, normal gamer's GPU comes with non-ECC RAM which is cheap. Not to mention the expensive part of workstation GPU is the support by the manufacturer.