@John *******
as an American citizen you cannot use any income for the first year Extension of the Stay Permit. You would have to use the minimum 800,000 THB deposit until you have accumulated 12 monthly transfers of a minimum of 65,000 THB, only then you can apply for the 1-year extension using the 1-year bank statements for these transfers coming in from abroad. Or you use the agent, they put 800,000 THB into your Thai bank account for 5 minutes and pay the Immigration officers to ignore that you violate the rules