Mike,
I am stunned.... didn't expect such a fast response

Knowing not all is at the end of 10Mb fiber (got it yesterday

) they would have to wait a long long time if the "true" size of the photo is say 1600x1200.
Yes I can see that once the picture is fetched and in the browser cache it sure would faster than rendering the picture once again, but in a different size, but then I suspect most people tends to look at them at a smaller size and only look at few with the full size.
Hmm as you say, there are benfits and drawback no matter what...
Cheers
/Lasse