Leslie,
There is some special logic for BW tables (as your example) that tries to avoid RUNSTATS dependent on statistics data from DB2 catalog. E.g. if a table contains 10 million rows it normally doesn't matter if you update the statistics or not after inserting further 1000 rows.
In this logic SAMPLE(010) is hard wired.
For any non-BW table the selected sampling rate is used.
Regards,
Thomas