daisydawg: I find that sewing with a dull machine needle is "harder" on the fabric because it takes more "effort" for the needle to punch through the fabric. (The words in "" are not the correct words perhaps, but they convey what I am trying to say). Sharper the needle, the easier it sews. Same thing happens with pins when they dull down - it is harder to push them through the fabric.
Hope this is clear????