Me? I'm a tech geek. I buy tech gadgets just for the hell of buying them almost on impulse. I waste a lot of money buying dumb shyt I don't need.
For the average consumer that's not a tech geek what do they see in these devices that justifies the feverish way they've been buying them? Honestly most of the games on them are previous generation titles. Sure they look a bit better but if I was a regular adult with responsibilities, a family, major bills, or whatever I couldn't possibly see blowing that kinda money on either of these things when there's no real value in owning either right now.
http://www.gamefaqs.com/ps4/releases/region-1
The PS4 has like 8 scheduled titles for the next 10 months.
http://www.gamefaqs.com/xboxone/releases/region-1
The Xbox One has 7.
in comparison in the same time frame the Xbox 360 has 15
http://www.gamefaqs.com/xbox360/releases/region-1
the PS3 has 20
http://www.gamefaqs.com/xbox360/releases/region-1
granted more titles will eventually come but for the immediate foreseeable future there's just nothing worth spending money on.