This group has been very helpful so I'm giving back my application details:
DTV approved today ( soft power - Discover Thai Nature ) via Los Angeles embassy. USA citizen, Applied on Feb 2, approved Feb 14 ( 10 days ).
I was not asked for any additional documents.
My physical and mailing address are in different states, so my bank statements show a different address than the address I confirmed with my utility bill. I thought it might be an issue, but it was not.
I'm retired and do not work ( mid 40s, so I thought this might raise flags). I selected 'retired' in the application. My bank checking statements do show a stable 'income' every month from investments.
I submitted 6 months of bank statements, the last statement showed more than the required 500,000THB and the 5 before showed close to it. I highlighted the totals at the end of the month in the PDF, and joined them into one PDF. I wanted to make this as simple as possible for the person reviewing it.
In addition, even though I know it's not required I also submitted my investment summary page ( I attached it to the joined PDF of my bank statements on the last page ). On the summary page I highlighted the amount invested that showed I could live a long time on the funds. Again, I didn't think I'd get denied by having this extra statement, and thought it could possibly help. Weather or not it did, i'll never know.
I wear glasses that do not obstruct my face and kept them on the photo that I submitted in the application.