There are many reasons to NOT want to merge. For me, the biggest sticking point would be not being allowed to decide who you play with. There are several assclowns that I don't want in my world, I'm sure more than one owner feels that way about me, and, if you merge, you're taking on a dozen owners that you had no say in adding. Of course, I have no say in Mantle(I trust tec to not let in dipshits) or Foxx(TWC in a public world) but I understand those situations. With a merge, you might be adding 10 guys who contributed to the downfall of a world. It's just not a situation I'd want to be in.