bitmapscan test, no success, bs is not faster

Hello, 

I tested bitmap scan and maybe I didnt find good examples, but with bitmap 
scan is slower than hashjoin. Only when I use non otiptimized SELECT bps 
was little bit faster. All my SELECTs are equal.
          bsp off         bsp on (ms)
SELECT 1   39.798          37.993
SELECT 2   0.310           0.330
SELECT 3   0.387           0.416

SQL and query plans are in attachment.

Regards
Pavel Stehule