RMAN: Number of Backup sets

Running Windows 2003 sp3 on EE database 10.2.0.3 x64 bit.

The RMAN configuration command is setup as below and the control_file_record_keep_time has been defined. Is there other parameter that I am missing? as I am expecting that the number of folders created should be less.

For example,

The ARCHIVELOG has folders from "2010_02_08" to "2010_02_16"

The AUOBACKUP has folders from "2010_02_10" to "2010_02_16"

The BACKUPSET has folders from "2010_02_08" to "2010_02_16"

RMAN> show all;
using target database control file instead of recovery catalog
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 3 DAYS;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default