Given that Quickr is becoming more Enterprise ready, some instances may require 400 or more (indiviual) entries. The Quickr place uses the Notes database ACL for access and the limit is 64K (has not changed since Quickplace). When using LDAP or some other directory, the name is stored in a DN format and that may take up twice as much room as a standard entry. This limits the total number of indiviual users to around 350, perhaps up to 400 users.
It has been suggested that the user base be broken into groups, but groups are not the answer. A consumer of the site cannot "notify" an individual then, but would have to notify the entire group.
Remove the 64K limit, or add a second functionality for groups to be added, expanded, etc, such as we see in the Notes Address Book.