Left 4 Dead fans have a lot to look forward to with the upcoming expansion pack, "Crash Course." Unfortunately, though, different platform versions are going to carry different prices: the download will be free for PC players, but it will cost Xbox 360 gamers 560 MS Points. While that might seem unfair, Valve has revealed that the Xbox Live price was something forced on them.

In an interview with Eurogamer, Valve writer Chet Faliszek explained that the developer would prefer to make expansions and add-on content free for its customers. This is why the PC version of Crash Course won't cost gamers a thing; Microsoft, on the other hand, wouldn't let this happen.

According to Faliszek, "[Microsoft] helped us get the first one out for free. We had the one DLC out for free. And I think... they have to look and say, wow, we're kind of being unfair to everybody else if these guys can do that. It's not like [Valve is] looking at this as, 'Oh my god, we need some money, we're going to charge,' obviously, or we'd do it on the PC. So it's just kind of the way the system works right now."