that's a gray area, then. It's technically a tourist visa, but one of the requirements to grant it is to have certain money in the bank for several months. I'd assume it should be more appropriate to show one's bank balance than cash, but who knows. I normally have more than 20K on my TrueMoney always, which is literally like cash for all Thai matters.
I didn't use secondary ID. Just my passport, the DTV printed PDF and the latest entry DTV stamp on my passport. Been using the advanced account for months already.