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Suboptimal field conditions could also play a role in encouraging such cooperation. Multiple queens would stand a better chance of completing their nesting chambers in time.
Even in already established colonies, adding extra queens to a colony cause little to no aggressive resistance. It's not clear if this due to a relatedness amongst wild populations.
Here's an interesting report on the subject based on laboratory raised colonies:
PRIMARY POLYGYNY IN THE ANT ATTA TEXANA :
NUMBER AND WEIGHT OF FEMALES AND COLONY
FOUNDATION SUCCESS IN THE LABORATORY
A. C. MINTZER
Atta texana by Che Hawkins, on Flickr