Evolutionary pressure against IE users .
png's are often a bit smaller than gifs and sometimes a lot smaller. They are almost never larger at the same quality (but people don't always reduce images to indexed before saving to png's when they should, but generally speaking a gif will be 20%-85% smaller saved as png. Yes, an image could be like 80kb as a gif and only 10kb as a png. The improvement isn't usually that large but 50% smaller isn't unusual).
png's are often a bit smaller than gifs and sometimes a lot smaller. They are almost never larger at the same quality (but people don't always reduce images to indexed before saving to png's when they should, but generally speaking a gif will be 20%-85% smaller saved as png. Yes, an image could be like 80kb as a gif and only 10kb as a png. The improvement isn't usually that large but 50% smaller isn't unusual).
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