@Paul ******
okay, you are confusing two VERY different things
A year-long, multi-entry Non-O VISA based on marriage <- bought from a thai consulate OUTSIDE the country (at a consulate that doesn't require proof of funds) which requires you exit/re-enter the country every 90 days
AND
A year-long extension of stay based on marriage from the immigration office INSIDE the country <- which requires 400K baht banked in an account in your name only for 2 months before you apply OR a notarized letter from your consulate stating you get 40K baht a month in income from abroad. On an yearly extension you do 90 day reporting.
They are totally different things though. And truth be told NEITHER of them is a 'marriage visa', one is a Non-O visa <- the O means other reason. It's issued because you're married to a thai. The other is a year long extension of stay issued because you're married to a thai.