mrmatthewk - 2:53 pm on May 15, 2012 (gmt 0)

Also speculating here but could it be down to amount of submissions approved? Obviously a free directory will get a constant stream of sites and expand quite considerably thus not really giving great quality signals. Paid won't get as many submissions.
This could also be why Rasputins directory has improved with only 25 submissions being approved per year?