How much I paid and how much my most expensive game is worth are two very different things
I very rarely pay over £100 for any game. There was a time when we considered £130 for Steel Battalion to be expensive, and then along came the slew of Guitar Hero / Rock Band bundles, followed by extremely expensive CE's...
These days it seems commonplace to pay over £100 for a lavish CE. A few recent ones I can think of where I have paid around £100 include Resistance 3, Gran Turismo 5, and Killzone 3, not to mention games I have paid more for such as the Black Ops Prestige Edition, MW2 Prestige Edition, Halo 3 Legendary Edition, and Halo Reach Legendary Edition etc... Skyrim and Uncharted 3 will be forthcoming games where I will be paying upwards of £100
But let's forget CE's for a moment. The most I have ever paid for a single game is £230, and that was for Steel Battalion on the eve of the release of Steel Battalion: Line Of Contact. I paid twice the release price for the original game a year after its release as I wasn't aware that Line Of Contact came with it.
Aside from CE's and Line Of Contact, the most I have ever spent on a standard game is about £130 for a factory sealed copy of Pokémon Crystal off eBay. It was the last Pokémon game I required for a full UK set, therefore I was willing to pay the premium on that. I have also been known to pay £100 for several factory sealed N64 games, but no higher
Which brings me back to what I said at the top of my post - My most expensive games I own ar my factory sealed N64 games, where I have personally been offered four-figure sums for certain games. Paper Mario is obviously the pride of my N64 collection, but I also have some very rare sealed copies of other classic games such as Mario Kart 64 and Mario Party 2, to name but a few
Second to these would perhaps be my sealed GameCube games, where I have been offered some obscene triple-figure amounts for certain titles. Mario Baseball is in very high demand!
Out of a collection of over 1,500 games, I estimate that at least 250 of them could easily fetch £100 on eBay, and of those I guess at least 50 or so of them could achieve higher than £200+ (and that's still not including any expensive sought after LE's or CE's!)