Someone with alt said they just don't want other people to get rewards so their lone wolf set (which they already have from season 1) would remain rare and unobtainable for general population. Also I've personally seen one of these bard alts in our party just saying 'afk' at start and sitting, checked lodestone and they were with a healer of opposite team in the same FC. So that also opens a lot of opportunities for open or hidden wintrading to increase their main's ratings.