Contains the factor that multiplied for the win amount gives the amount of fees deducted by Betfair from the next win. It can contain a decimal number from 0.02000000000 to 0.05000000000. So for example if case of a winning bet of 100, if @fees is equal to 0.05, the fees pais to Betfair will be 5.
Example: <place condition="@is_horse_selected=1" price="@best_back_price" size="2*(1+@fees)" />
When the horse is checked, places at the best back price of the horse a bet of size 2 adjusted to the @fees to pay.