I think the Titan caters to extreme users anyway and is less intended for gaming than workstation/science and I don't think "Bang for bucks" matters that much there, it's rather "How much computing power can I cram into as less space as possible"
But I'd be kinda dissapointed in a not even 10% faster 1180. Still run my good ol' 970 which is still rocking nearly everything. Hoped for something around 15-20% increase against a ti. Else, It would be cheaper to wait for 1180 release and then get a much cheaper 1080ti instead. Even if it comes with RayTracing, I don't think ANY game soon'ish will use it noticable, at least not before next GPU/Console Gen and even then only if Consoles come with some Hardware for it as well.