The statistics do indeed show that the majority of the 20,000 converting each year in the USA are women. Your theory as to why this is the case has to be proven though.
I personally know of women who converted first, and then married Muslim men who they did not know before their conversion. I also know of non-Muslim men who converted first and then married a Muslim lady who they had not known before, and I also know of non-Muslim men who converted so as to marry a Muslim lady they were going out with.
The women featured in the videos posted above show the reasons why the men and women chose to convert. Have you any reason to believe that these reasons aren't a feature in the majority of the 20,000 conversions each year in the US?
Cheers,
Shafique