And you're talking about Source engine from DOTA 2 that is quite old, where twitch fast response is more important than most casual gamers need. We're talking milliseconds here. Sure the graph looks like a HUGE difference, but we're talking milliseconds. As I said before, for twitch gaming, it'll help, but for the casual gamer, 2 milliseconds isn't a dealbreaker.
I'll take a more quiet, less noisy, less power consumption, and cheaper rig overall than an overclocked CPU that dissipates more heat, consumes more power, and runs a bit louder. I've overclocked for what, 15 years, and I never really had the need for the extra performance gains.