3 times cheaper and also likely to be the best version of the game, as is the case with most multi-platform titles. I feel bad for anyone not mainly gaming on PC these days.
It's cool to own a console for some exclusives and sports/party games but ignoring gaming on PC means missing out on entire genres, cheap prices, a whole lot of games that only release on PC, backward compatibility and some of the greatest things this industry has to offer right now. And once VR launches next year, it'll be even more so.