@T**
in the unlikely event the extension requirements are easily met, it saves money and more importantly time to get it in country, particularly if you are far from a border/airport. A lot of DTV holders are busy working and it can be a hassle to have to schedule a border run around work.
If they'll take bank statement showing money in a foreign account and whatever other documents like showing proof you are working/have income, many people would be able to show that and if that's it, why not extend in-country for 1,900B.
I could see it being more complicated to the point it does make sense to just bounce but it's at least possible that immigration will only need holders to show stuff they have anyway or can get easily. Will be interested to see when someone actually tries to do an extension how they get on.
Bouncing is always a backup option in case immigration do want something you can't easily provide but I can see the appeal of not *having* to leave at the six month mark.