While we are at it, I reckon we should limit the size of images in posts too. Some of them recently have been 2000 pixels wide - not too many screens can see all of that image in one go.
Why not instead of banning large images in posts, request that users put a disclaimer in their post stating that pictures are large? (e.g. [Contains Large Image]). Limiting the size of content does not make it fair on people who put out large amounts of money for broadband connections for the purpose of being able to download a large amount of data in a small amount of time.
A disclaimer is not much use, because the images are inline and appear with (although somewhat slower than) the text.
It's not the bandwidth, it's just very inconvenient having an image in a posting which cannot even be displayed on a screen without scrolling. Not only that, the wide image makes the whole topic wide, requiring sideways scrolling just to read the messages.
If people limited images to what could be seen on a normal screen (I would be happy with 1024 max but others might prefer 800 pixels wide) then you could see the whole photo at once - and that's a much better presentation of the images.