What country do you live in? XIII-2 would be like $10 USD in the US. It's pretty shitty that companies would charge the same in euros or pounds.
It sucks, but it's how it is. I live in Italy but that is what Euro-countries get in general. If we look at MS sales, it's mostly the same as well, sometimes worse in fact: whereas 60 bucks seems to be the maximum in the US, here we can get to 70 Euros as well, not just the 1:1 conversion of 60. This also makes it so that a lot of percentage deals on the XBL marketplace actually are far more expensive in Europe than in the US: we had multiple times where US had a game for like 10$ and ours was 25 Euros, because on the European marketplace it did not receive the same price cuts. The most recent example is 2014 FIFA World Cup, that was like 18$ in the US if I'm not mistaken, but around 21 Euros here, given the different original price to which they added the same percentage. Sometimes, we get lucky-ish: right now you're getting Remember Me for 10 bucks, for it's 7,49 which is around the same price. In super rare cases, we even get A LOT better deals: 2 years ago or so (before all these Ultimate Game Sales), Max Payne 3 went down to 15$ in the US, and for some reason it was 5 Euros here. Back then, that price was absolutely bonkers, almost unheard of that MS would do such sales so everyone lost their minds, haha.