At the beginning of each soccer session the number of players is typically growing.  MESC tries to keep what parents pay as close to the raw cost as possible.  To achieve this the cost is calculated mid-session when the player count stabilizes and cost can be divided evenly.  At that point your Demosphere account will be invoiced.  A session club membership fee is built into each soccer season.  There is also a small down-payment for the league fees included.  Both of these are represented as the cost shown at the time of registration.  Because the final cost is calculated mid-season as described above you will be invoiced later for the balance between the initial installment at the time of registration, and the final cost.  This keeps the overall cost to parents at the absolute minimum possible.