depends what the relationship is between the alliances in the coalition, and the amount of alliances in them. I was part of an alliance and we had one sister who was ranked maybe in the only top 20 while we were the dominant alliance. We shared 2 states, and it worked out great, we were together for as long as the two alliances were in existence virtually(many months).
Prior to that i was part of a coalition where multiple top 10 alliances were forced to join mine via the common join or die recruitment. they changed their names and became part of the family. This did not last too long, and even when it was in existence, the smaller alliances in the coalition would send only a handful of cities on invasions where we would send one from almost every member.
edit: NO ONE is allowed in my farms though, blue or green 
double edit: im with bertanderine, 1 sister is ok with me but otherwise no blues for me please
Server 176 - Furbz
Server 166 - Furbz5 (retired)
Server 147 - Furbz (retired)
Server 113 - Furbz (retired)
<20:15>From [Nina] : you are hurricane katrina :-)
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