There are a lot of people who use EDGE/3G without unlimited bandwidth plan. Also, in a lot of countries people have pay-for-traffic plans. Since Chrome autoupda

There are a lot of people who use EDGE/3G without unlimited bandwidth plan. Also, in a lot of countries people have pay-for-traffic plans. Since Chrome autoupdates itself, and there's no way to disable this, saving kilobytes has good value.