I was looking through Sedo’s recently announced numeric search engine and found a few interesting listings
The domain name 8888888888.com (that is 10 number 8’s) for $190K; 8888888888888.com (that is 13 number 8’s) for $88,888
88.club is listed for $60,000
88872.com is listed for $24,000
52188.com is listed for $23,000
868888888.com is listed for 9,999 GBP which is about $15K.
888888.net is listed for $66,000 and has a bid of $6K.
There are plenty more numeric domains for sale on Sedo in various extensions but at the moment all of the listing are in pnly Chinese.