I utterly disagree with all of you ignoramuses! If 100GB is the lowest it can be then 100GB it will be. How do I know this? Well, if there's one thing I've learned on my short time on earth it's that money never lies, and the money says that the 100GB estimate will already be highly optimized. It's not just us who has to pay for bandwidth...They have 801,221 backers at the time of writing. If each one of them were to download the finished client just once that's 641PB. Even 1GB of difference in the client represents 6.4PB of data they have to pay a third party to serve up. The size is more likely the natural storage requirement inflation for progressively prettier graphics and the scope of the "'verse". Crysis 3 weighed in 10GB and, in my opinion, looked kinda same-y throughout. Star Citizen is going for 100+ systems (each having multiple worlds and locales), each with vastly different texture and sound palettes...not to mention the multiple space environments or the fact some of the capital ships are unique, sizeable environments unto themselves...and all as photo-realistically rendered as the engine allows. Given that not optimizing it could add millions to the data budget I think they're much more likely to spend thousands, or even tens of thousands, on optimizing their content delivery system. TL;DR: Money talks. Money talks. Dirty cash I want you. Dirty cash I need you. Ooohhh!