There seem to be a growing trend for similar patterns (see below data from namebio). Interesting fact is that there were no transactions in 2015.
Domain TRDate Price
3-45.com 4/8/2016 304
5-67.com 4/8/2016 304
6-78.com 4/8/2016 559
8--5.com 12/6/2015 202
96-2.com 1/9/2016 120
9-91.com 4/8/2016 306
00-0.com 8/29/2016 112