Id love server 6 to merge aswell, so I could get more 10s around me. I buildt 5s all around me when I thought I wasnt big enough to hunt 10s, and would never be (silly me.. )...
Though Id never go all out 10s either. I would go for a nice mix. having many 10s close, and a lot of 5s outside the 10s. (that way I avoid enemies to port right on my doorstep aswell....