Retrowise - I think ~ 40 EU for complete Act Raiser 2 - and my limit is somewhere around 50 british pounds mark.
next gen ... my most expensive was PS3 60 GB at launch 560 EU ... aproximative (with 2 games and 1 extra controler) / most expensive game (present from my wife - I didn't payed with my own money but still) ~ 160 EU God of War III Ultimate trilogy edition (brand new from store)
Most extraordinary thing I got -> Nintendo M82 demo unit - for free with a bunch of NES games

.
Some statistics :
From sep 2009 until present I've spend ~ 14.000 EU on videogames

(acording to my calculation) acquiring ~ 2000 games/consoles/accesories. ( including - 2 PSV - i've lost 1 in a plane after ~ 48 hours lach of sleep / 1 3DS console / 1 PSP go / ~ 100 collector edition games ) so the media is ~ 7 EU / item which I consider decent, probably around 5 EU / item is I add to equation the purchases from 2006-2009, the "grey" area when I just started collecting and I was deorganised.
I never sell games (maybe only to my closest friends and I don't "rip them off" so in general if I've payed 15 EU for Terranigma (whitch I did) I offered the game to a friend the for ... 15 EU

/ that's why I prefer to do trades).
I finance my hobby from my salary not from "reselling".