they have talked about easing the requirements for retirees as well, that is meant to be coming in the next few months. Possibly a reduction of the O-A insurance requirement.
this depends on the consulate, no? As the MFA says a sponsorship letter is a possibility. I know some consulates aren't, and aren't accepting payslips either, but it's a theoretical option for the visa.
that site is not official anything, it's just a site designed to capture search traffic. It doesn't say anything about it being limited to two entries within the five years anyway.
The government have been clear at every point it is a multiple-entry visa. What you describe is a double-entry visa, they used have these but this is not that.
they do mention possibly having to verify the financial proof for extensions, although it was in the section about following spouse visas. More likely to have to do that at an extension in country than arriving at a border I suspect, they don't tend to check very much at the borders.
from what the MFA has been saying so far, everything points to that they accept people can leave and come back immediately. I was wondering myself on this point, whether they wouldn't want people doing this, but everything they have put out about it, or when they have been asked, they have said yes you can do border bounces with it and get another 180 days.
it's very possible the extensions will be 1,900. The announcement in the Royal Gazette stated the visa fee was 10,000 but made no provision for a different price for extensions, and there has been nothing official to suggest they will cost that. I suspect this was misreporting at the start. Siam Legal reckon 1,900:
the 500k (equivalent) you show in a foreign bank outside Thailand when applying for the visa (which can only be done outside Thailand). It doesn't have to be in a Thai bank.