Some people are doing runs to Savannakhet to get the marriage visa with no funds in the account.
Savannakhet recently changed to requiring funds for the 1 year visa, so some people are only able to get the single entry there, since lack the funds or simply don't want to keep them in a Thai bank.
Savannakhet also recently changed to requiring you to reserve a place in the queue AND stay an extra day for processing, meaning you have to stay there longer, and plan ahead.
Immigration also recently announced that visa exempt land border entries are now unlimited.
So some people have the choice of:
a) Savannakhet single entry +60 day extension, every 5 months (with it's increased hassle recently)
b) Border run for 60 days visa exempt + 30 days + 60 day extension, every 4 months
And some people find the 2nd option more appealing. So rather than get an extension or fresh Non-Imm O from Savannakhet, may want to start using visa exempt entries instead.