Probably the same reason I've ditched my Avid elixir 3, bleeding them is a nause and parts are not so easily replaced. Hence i got rid of mine because I was forever watching it to make sure I didn't break it, where as my BB5, I have a spare calliper and lever sat in the cupboard so the elixir is sat on my xc bike at the moment because I'm less likely to fall off and break it... Especially when your a beginner like me