I said this in another message like this.
It's due to limited space and internet speed. RGT server is not a multimillion-dollar server or connected to a very expensive internet server costing over thirty thousand dollars a month. If every user could upload, say, fifty megabyte files each, just imagine how lagged the server would become.
Not to mention the storage space. RGT's server doesn't have hundreds of terabytes of space.
I don't know exactly how much it has, but it certainly isn't what say MegaUpload, Dropbox, Google Drive, or OneDrive have.
As for the internet speed, I am guessing it's The Boss man's own internet.
I might be wrong, that's just a guess. Again, it's not on a 20 Mbps service.