Cluster size of 8 is the only size to do

For a large organization that has more than 8 VMware Hosts (nodes) one should only make 8 node clusters for the time being according to the vSphere 4 Config Max doc.
http://www.vmware.com/pdf/vsphere4/r40/vsp_40_config_max.pdf
If you look on page 7 it says “Configurations exceeding 40 VMs per host are limited to cluster size no greater than 8 nodes“.
What that [...]