I've tested a few times and turned it off for a day - bandwidth usage spiked significantly on all 3 occasions I did this.
Images themselves are not a particularly large percentage of the bandwidth required to display a vbulletin page - it's the tables, css, white space, comments and other formatting that really blows it out.
My forumhome page (without images) is 105,316 bytes. Using the lightweight style, the same page is only 7,659 bytes.
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