Harvest's customers fail to reap rewards

China's investors are learning the hard way that size does matter...but not the way they might think. Beijing-based Harvest Fund Management launched the nation's biggest-ever fund near the peak of China's A-share frenzy in early December. This was a record-smashing blockbuster by any metric, not just for China but worldwide. Not only was it big, raising RMB40 billion ($5.1 billion), but doing so within hours in a single day.Mainland sources suggest, however, the Harvest Strategic Grow…