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In early of season, Bayer Leverkusen did not play well, lost many points but with the past amazing season, I believe many gamblers bet on Leverkusen and lost money. Except Bayern Munich, other clubs including Bayer Leverkusen have performed widly unstable in this season and it only help bookmakers to get more money from gamblers.
It was indeed very difficult to pick a champion at the start of the season, I also wavered between Bayern and Dortmund for a long time. Above all, it was hard to predict whether Kompany would be successful and how successful he would be. The pressure on the coach if a season doesn't go as planned is enormous at Bayern.
But I also don't think they'll let the title be taken away from them now. Otherwise they would finish the season without a title, which would probably also mean the end for Kompany.