some others you will find touching the £100 mark, like dragon warrior
another title im suprised on the value is resident evil 2 on gamecube its £25 - £30
If you're talking about Dragon Warrior, the reason its most likely so expensive in Europe is because they never released any of the Dragon Quest/Warrior games in Europe until Dragon Quest VIII on the PS2. So it would probably be cheaper to just import a US version of the game than buy one locally from Europe, where they will up the price.
That said, even a used copy of Dragon Warrior can be $20 US and a used copy of Dragon Warrior IV with no box or manual can be anywhere from $40-60 dollars US.