What counts as DLC? Do boxed PC game expansion count as DLC? Like Diablo 2: LoD and Starcraft Brood Wars? What about the WoW expansions? I bought some of those boxed, some of them digital. But if those DON'T count, then why would stuff like the Witcher 3 Expansion Pass? I don't know where to draw the line. The fact that it's downloadable seems kind of like a circumstance, not really the defining factor. And if it's literally all add-on content for games... A lot.
Even just looking at the C&C series, that's C&C Covert Ops, Red Alert Aftermath and Counterstrike, Tiberian Sun Firestorm, Red Alert 2 Yuri's Revenge, Generals: Zero Hour. It's ever single expansion Blizzard has ever put out for any of their games, including all the WoW expansions.
I'd probably ball park it between $1000 and $1500?