SBT, Actually you don't.
In theory you might, but in actuality you do not.
Even if all the players did add on the extra 10 per 100, the only ones that it matters to are the winners.
In your example you have 14000 translated to 15400, theother way you have 8000 translated to 8800. So a total of 23400 on the game. In your way 2200 of that is your free and clear, depending on which side wins gives you the particukars, but it is not. Some of that was going to be lost by the losing side anyways. The only ones that really lost out were the guys that had the winning side.
So again, using your numbers. the side with 15400 wins. You have to pay out 14000 to the winners, and you do have the excess 1400 left, BUT the 8800 on the other side doesn't make up the difference, so rather than having the 800 "the other way" as you say, you are actually a negative 3800 for the day( -14000 +8800 +1400) . Granted the 1400 helps out, but you still are in a decent sized hole.
Now if the 8800 side wins, you pay out 8000, keep the extra 800 layed, and also the 15400 lost on the other side. For a profit of 8200. (-8000 +800 +15400) So on the same game you could be in the hole 3200 or profit 8200. If that isn't gambling I don't know what it is.
It is all semantice, because unless you can fine tune to the dollar it doesn't mean much. I will shop for pennies, but only because I can fine tune it to a perfect position ( I usually don't as it is complicated sometimes) But when you don't have control over how much is coming in each way (unless you are laying off) a penny here or there isn't going to break a larger place.
Same as mortgaging and refinancing, unless you find a place who will give you the right numbers it is best to finance a loan yourself. But if they have someone whom they can't work with, and you can, it is a give and take situation. Again, my theeory on the divide and conquer, the more books the better for everyone. Not one place is going to get buried because they can always sell it to another book, at a loss of a couple pennies for sure, but it minimizes their risk. Just like with banks, they can finance everyone, so they sell you to someone who can, again at a cost to them in some instances. But it averts their risks.