UPDATE: After a little googling I believe I found where the default of 200 pages per second came from, but it is from ESX 2.1 documentation -
/proc/vmware/config/MemShareScanTotal
This ESX Server option specifies the total systemwide rate at which memory should be scanned for transparent page sharing opportunities. The rate is specified as the number of pages to scan per second. The default is 200 pages per second.
After looking into the Advanced Options of an ESX 3.0.1 host, it was found that the number of 200 is still the default. Also, it stated that 10000 was the maximum.