Gaming PC : 5 years at most then need to be replaced
Console : now 7-8 years of life
PS plus : 50*7 = 350$ - (at least) 12*7 games
350$ - 84 games (15$ average)
350$ - 1260$ worth of games
PS plus is not a cost, as its name implies, it's a plus.
Edit : Ps eye and controller are 60$ each (official ps4 website)