List your known scam writing sites that let you write but pay only US residents  

The sites you list are NOT scam sites because they do exactly what they say in their Terms and Conditions.

A 'scam' is a situation where someone makes a promise of remuneration which they have no intention of fulfilling. All of the sites you mention have clauses in their Terms of Service which make it quite clear that, in order to be paid, you have to be a resident of the USA.

1) EHow has now closed its Writer Compensation Program to new users (though existing users are still covered by the Supplementary Terms: https://www.ehow.com/forms/EarningsTerms.aspx

2) AssociatedContent's FAQs are quite clear: http://www.associatedcontent.com/faq.html#B3

3) Gather issues Gather Points and the User Terms clearly state that these are ONLY redeemable within the United States: http://www.gather.com/userTerms.jsp (see 6a)

4) Examiner.com calls its contributors 'Examiners' and is clearly and specifically a North American, English-only site: http://www.examiner.com/assets/examinerfaq.html There are supplementary Terms when you apply to become an examiner and these may contain restrictions with regard to payment to non-US/Canadian residents.

MyLot is also unable to pay members of certain countries. This is clear when you enter your registration data and in no way constitutes a promise of payment which they have no intention of honouring.

If your business is to write in English, I suggest that you acquaint yourself with the meanings of any words you use. Accusing the above sites of being 'scam' could be construed as libel and is certainly inaccurate.