Wrong. It is actually more expensive to do a visa run than an extension. I could just as easily say that people who do extensions are just scraping by and can't afford to do a visa run or that they are too nervous to cross a land border. I would be wrong of course , just as wrong as someone who thinks people do visa runs do so only because they haven't got 400,000.
I loved doing them. 5 or 6 nights away from home, traveling to another country with the wife, checking out interesting sites on the way. We would give up doing extensions tomorrow and go back to visa runs but can no longer do so because the MIL is now needing 24 hour care.
Luckily , our immigration office is very friendly so the extension is pretty easy experience. But I have lived in places where the immigration officers were rude and corrupt and a nightmare to deal with. Pot luck.