Urahara helped visored, isshin, Aizen(Aizen couldnt make successful hogyoku so he helped him), Ichigo,Chad, Orihime, Renji, Soul society, captains(to retrieve their bankai),etc because he likes to help. Well, according to Buddhism (Lord Buddha,Siddhartha Gautam) lore, Guan Yin made a vow to help...