1. A method of online valuating a client in a computerized service system comprising a processor operatively coupled to a memory storing a plurality of records informative of monetary chunks, each record informative of the monetary amount of the respective monetary chunk and tagged with a client who owns the respective monetary chunk, the method comprising providing by the processor in cooperation with the memory: identifying all clients directly involved in a monetary event; for each identified directly involved client C i , searching the stored plurality of records for all records informative of monetary chunks tagged with the client C i as an owner and associating with the client C i a virtual account A i , the virtual account A i being informative of all monetary chunks in an ownership of the client C i , thereby giving rise to a plurality of virtual accounts associated with the identified directly involved clients, wherein each monetary chunk in the virtual account is further tagged with a depositor client who introduced the respective monetary chunk into the service system and with respective timestamp; identifying every client tagged as a depositor client to at least one monetary chunk corresponding to at least one virtual account of the plurality of virtual accounts, thereby giving rise to a plurality of clients indirectly involved in the event; and valuating one or more clients directly or indirectly involved in the event, wherein a value of each given client is calculated with consideration of all monetary chunks corresponding to the plurality of virtual accounts and tagged to the given client as a depositor client.