Bido has already 20 transactions reported by Namebio in 2016, they had 27 in 2015 and curiously 0 in 2014, 2013, 2012 and 1 in 2010, then about 20 in 2009 and 2010
It could be that many transactions are not public.
similarweb.com estimate their traffic at ~20k visitors per month.
As a comparison, flippa had 109 transactions in 2016 and sedo 65 (but GD has 1159)
I'm curious to know if any of you is still using their system