For new members the bandwidth really can be a problem and editing posts also takes the same amount of bandwidth as making a news post.

i just created a simple tutorial that can avoid the bandwidth usage:

(By using "site inspector" editor to preview changes)

https://steemit.com/steemit/@techtek/how-to-fake-your-steemit-pay-outs-and-prank-someone-how-to-edit-and-preview-your-posts-without-using-bandwidth-simple-trick