While I agree it's ridiculous, Apple imposes a limit of 100MB for cellular downloads - http://www.macrumors.com/2013/09/18/apple-increases-over-the... - so even though it's a more reasonable figure, still a showstopper for obtaining your 230MB wi-fi driver.
This is for app downloads; you can't install an app larger than 100MB over cellular. You can download generic files of any size in the browser, or from within apps.