It would use more of your own bandwidth but you stop "stealing" other people's bandwidth and you have total control over the images so if someone decides to delete or change them one day you still have them.
I know I have a user who posts a weather map graphic from time to time. It gets updated every few minutes, so if I do end up using this on my live forum I should remember to put whatever domain it's from on the ignore list else the image will never update.
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