The worst batsman in the team is placed last in the order. Why would anyone do anything different?
I think there are circumstances where you would consider putting a better batsman at 11, and the chance to do so happens more often than you might think.
Let's consider the traditional approach. Why does the worst batsman go in at 11? The main reason is to make sure that more talented batsmen have more time at the crease. Going in at 11 gives you only the 10th wicket stand to score some runs. Going in at 8 gives you a potential of 4 stands to make a difference to the score.
It's especially useful in longer games (2 days plus) to have players at 8 or 9 in the order who can hold up an end while a more talented batsman helps you build a large total. Except for nightwatchmen, this is the technique that has been used with success in first class and Test cricket as long as anyone can remember.
However, consider a typical English club game; a single innings match played in an afternoon with the potential for a draw.
Your team bats second and the game is drawing to a close finish. In the last over you need 4 to win when the 9th wicket falls. Who would you rather see walking to the wicket at that point? Someone who doesn't know which end to hold or someone who can hit the winning boundary?
Now put the situation another way around. You are battling to save the match and lose the 9th wicket with 5 overs to go. Wouldn't you prefer to see someone who can bat it out coming in at 11?
The point is that number 11 almost always has one of two jobs to do: win or save the game. Both of which require a certain level of skill under pressure. Isn't it a bit odd to make the worst batsman in the team bat in what could be the most critical position?
That's why, when batting second, I prefer to put poorer batsmen a little up the order and save the slightly better man for the last slot. This not only means you have more faith in a result going you way, it also gives the lesser batsman the message that you have faith in his ability. You never know, his or her new found confidence might even lead to an improvement in the overall batting of the tail.
What do you think?