replication impact on write throughput

[Bill de hOra]

If I had 10 Cassandra nodes each with a write capacity of 5K per second 
and a replication factor of 2, would that mean the expected write 
capacity of the system would be ~25K writes per second because the nodes 
are also serving other nodes and not just clients?

I know this is highly simplified take on things (ie no consideration for 
reads or quorum), I'm just trying to understand what the implication of 
replication is on write scalability. Intuitively it would seem actual 
write capacity is total write capacity divided by the replication factor.

Bill