Customer would like to have details on Clustering resources usage

IHAC that currently implemented an application using 6 WLS instances in 6 domains (!) and 2 phisical servers. I mean they have 6 admin with a single managed server each. They did so to implement an High Available system, working Cluster-like.
When I told them that a better configuration should be 1 Admin and 6 managed servers using the standard Clustering WLS features they claimed that it will be resources consuming, more than the current configuration.
Is there any document where we describe the best way to implement Clustering and a benchmerk where we show the differences in system usage when using cluster and not using it, and also the Pro/Cons of having a clustered architecture?
I cannot find a the info in the standard WLS docs.
They have a WLS 9.2.
Thank you !
Chiara
(ACS Service Manager)

The following doc tells more about why one should cluster.
http://download-llnw.oracle.com/docs/cd/E13222_01/wls/docs92/cluster/overview.html#wp1011562
Scalability
High-Availability
Application Failover
Load Balancing
If your customer doesn't need the benefits mentioned in the above doc then, there's no need for them to cluster their app.
I agree with your customer that cluster adds resource overhead. Most customers in production environment choose high availability and load balancing against additional resource consumption at runtime.
Following the performance tuning best practices and understanding customers application, one can decrease the overhead of clustering to some extent.

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