That's fine.
But it doesn't allow for the size of the overlay.

Try this!
We can all calculate the odds of events occurring in roulette.
And what do we find? - the casino pays out slightly less than those Odds.
So if we bet Underlays , we will lose in the long run.

So we must NEVER bet Underlays.
And it follows that the closer the animal is to being an underlay , the less we should have on it.
And the bigger the Overlay , the bigger the wager.

So in the example , the #8 is only just an Overlay , so it would noy be worth as much an investment as the #2 , which is a HUGE Overlay , yet both animals are rated at a very similar Price.