Redshift and luminosity distribution of BCGs (Kong & Cheng 2002; Gil de Paz et al. 2003), metal-poor galaxies from 2dF (Papaderos et al. 2006) and SDSS (Kniazev et al. 2003), our 11 metal-poor galaxies, and the 3 nearest GRB host galaxies (Stanek et al. 2006). M _B is calculated for the 2dF galaxies assuming ( B − V) = 0.5 (Papaderos et al. 2006). M _B is estimated for the SDSS galaxies from SDSS photometry (Kniazev et al. 2003).