Ok in your example, you spent £3600 on games @ £45 each.
That's 80 games. Please show me your collection of 80 PS3 games from as far ago as 8 years sat on a shelf ?
You can't show me, because you don't. Because you traded them in. Completly ignoring your fallacy that PC gamers buy a PC and then don't spend a penny more on it for 8 years, you will have traded your console games in and got part of your money back.
Further more, you can buy pre owned games on console which puts the whole £45 a game maths out of the window. Something you can't do on PC.
This thread was never about pricing, so stop trying to kid yourself that PC gaming is no more expensive than console gaming because its just not.
And lets focus instead of what else can PCs do that consoles cant ?
Proper community run and owned dedicated servers. The sort that let you get that enables games like Arma and Day Z to run. These servers are owned or rented by players and run by them for others. BF3 + BF4 touched on this on console, but no other game on console has come close, and even then it wasn't quite the same since you could only change the settings in the UI and didn't have the same raft of server mods that the Battlefield server for PC had.
This sort of thing would just never work on consoles.
The truth is whatever savings you get from pre-owned games on console, PC users get more in low prices in Steam sales, game key websites and so on. If you want to go like for like, you might pay £15-£20 for a used PS4 game. I can get the same game in a steam sale for £5, so the costs of games are all relative.
I have spent £384 on PC games since November 2011. It has bought me 40 titles, remembering that is only about 3.5 years so I am bang on target for 80 titles in 8 yrs as per my 'BS' example.
By comparison I have spent £364 on PS4 games/PS+ etc since December 2014 and it has bought me 15 titles - every one 2nd hand by the way. I agree I could trade them in, but I don't. I like to keep what I have bought, but I accept for others it is different. But even if I did trade them in, am I going to make the same kind of savings off a new PS4 game (or a used one) as I will see in a steam sale, or from CD-keys, or GOG, or GMG? I don't think I will to be honest.
I do not trade titles in, never have. I never had a PS3, I had a 360 and you are correct I do not have 80 360 titles. But not because I traded them in but because games on my PC were better and cheaper so I didn't really use the 360 very much. It only ever got used for Forza and fight night with my mates and lego games (the wife likes them - honestly!

) because everything else was better to have on my PC - better graphics, cheaper to buy, easier control method (IE KB/mouse). I also didn't need an online subscription on my PC. I think I have about 20-25 games on my 360, but I am not sure. I have lent my nephews quite a few and haven't seen them again
As for your last paragraph I agree entirely - the community side of gaming on PC tends to be far more evolved.
I was also completely honest about not touching my former PC. It remained the same system from day 1, but the only thing I did buy was a new mouse come to think of it. My MX518 lasted 6-7 years as I recall then died, so I had to buy a new one, but not a massive cost.