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Article from 2007. Back then, WoW was still on rise, theme-park games that later turned into financial failures (AoC, WAR, SWTOR) were still only being prepared. ESO is probably the last huge-budget themepark title.
If ESO has 300 milion budget, how much did SWTOR have with all its glamorous voice acting and adv campaign? The 500 milion budget now sounds a lot more plausible.