There's been promotions over the years for Dropbox to raise your storage space for free. I've managed to get mine up to 26GB when I initially started with 2GB. The same is true for the other cloud services, got 50GB free for Google Drive when I got my HTC One M8 last month. SkyDrive started with 5GB but I've gotten it up to 50GB with a promotion that I can't remember where. So while it's not unlimited, it's definitely a lot of space. The only reason to need more is if you want to do offsite backups or have a ton of RAW photos or DVD rips. Although if you want offsite backups, Crashplan would be a better bet because they do offer unlimited storage with their payment plans.