People already DO read their posts before posting. Sometimes I proofread mine numerous times so "KNOW" with "1,000,000%" certainty it has to right. Then the moment one presses 'submit', out of the corner of one's eye one sees an error that simply can't be there because it was checked umpteen times. Or having posted, one reads the result and finds errors immediately. So reading before posting clearly doesn't help, and I wish folk wouldn't tease by continually suggesting it.