as
@Paul ********
stated IF you meet the financial requirements (proof of 40K baht a month in income OR 400K baht in a thai bank accoutn in your name only for 2 months before you apply for an extension) you can apply for a yearly extension of stay at the immigration office and not have to border bounce every 90 days.
Most people on the year-long, multi-entry Non-O visa based on marriage either don't want to meet the proof of funds, can't meet it, OR travel so extensively that it is easier to just get that year-long visa (because it's unlimited entry) and then bounce every 90 days.