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MaximumBunny: ...
Just wanted to say that. And in addition, there are people who will quite literally make a use of anything that allows them to get working keys - like, for example, when keys for Natural Selection 2 leaked, these resellers jumped right at the opportunity and cost an indie dev a fair share of money.
Big_Boss: Is a legit site?
They have Bioshock Infinite for 19€, and many other games at a very low price...but I doubt they can sell these keys or not.
The site seems like an Ebay, only selling key.
To find a site is legit or not, you can do some methods. You can check whois lookup for a domain name. Visit the site here you can check whois information for domain name. If the information is public and looks legit,you can note the email id, contact number of the domain name owner or administrative or technical department or else sale department. It will help you to contact them if you have any problem after using their services or buying their products. Then you can visit the site check whether the site is trusted or not. If the result will "High Trust Rating. This Site Looks Safe To use." It is good site. Then you can visit here you can read users or customers reviews, ratings and feed backs about the site and their services. If they said good, you can start using the site.