Adding to Chuck's and rowanwitch's examples, here's another good reason for giving a long reply: Couple of weeks ago I was searching AB for some old info and came across a reply where an ABer had posted a link to a poem. I clicked the link and landed on a porn site so graphic I'm still reeling :))) I can take it but kids doing research for their homework shouldn't have to click a link that no longer leads to the same site content as when the link was posted. So in that case and many others it would have been better to just copy and paste the whole poem, thus possibly exceeding the character limit.