When you activate the service, your balance is withdrawn 10 rubles and your listing get the first of the "Top-Priority". Then you can change the number of "Top-Priority" and position your listing.
The Service Fee is withdrawn from the balance at 00:00 MSK with the total number of the "Top-Priority". The cost of "Top-Priority" is 10 rubles per day. If the next write-off on the balance sheet doesn't have enough money, the "Top-Priority" listing will be turned off.