I feel the pain, without even mention all the money i spent on hardware to kepp the machine up to date to run the latest games 
see the positive side
this computer will last long It ist still something different ... having an own powerful PC at home or using cloud gaming services. I have used several cloud gaming services over the years and although they work pretty well (most of them, most of the time) you still have this slight delay. It doesn't really effect your single player experience, but it still there and you notice this. Every time I was playing I was just thinking ... something is off. Maybe you get used to it ... but personally don't love that. Furthermore this services cost money, especially Playkey is very expensive. Instead of paying 30 bucks a month, you could safe the money and buy every 1-2 years a new gfx card.
No, it can't be solved, because there is not internet connection that is "instant" :-) Pushing data through a pipe takes time. You can't solve that problem, you can only shorten the delay. And you notice a 30-50ms delay, which is pretty good in online games, but not for input devices (mouse / keyboard). People are just not used to it. Particularly when games are more and more optimized for 60 FPS, to offer that buttery smooth controls ... that you won't have in cloud gaming ... ever.
I guess Playkey is also taking into account lower pings on future connections. 60 FPS are like having a grahical ping of 16.66 ms. Thus, if you are able to communicate with Playkey servers in less than that time, gaming experience can be fluent even on FPS. Of course I mean request+response so it's still hard to reach but well, not impossible IMHO.
As levyashin pointed out, the game also affects that. You can play non-ping-critical games like strategy, adventures or similar without affecting the experience.
