Hmm, regs are about $7 now and thats $35 or so...I wouldn't, 5N's are just above reg fee ($15 ea or so) so I doubt these repeating 6n's would be a worth a ton...
I agree that the vast majority of the one million nnnnnn.coms are worth regfee or less. However, I'm curious whether domains that contain just two unique digits: 111122.com, 112121.com, 111121.com, etc. might have some value above regfee. There aren't many of them to begin with, and there are very few left!