I am sure that only applied to overstayers. Bad guys are OK if they have money and the correct visa haha. My visa extention requires an interpol check every year.
You only need that when you apply for your extention and the money must have been in the account for 2 months. You can use a combination of income and money in the bank.
I know three years ago I was on my second 6 months tourist back to back visa issued in the UK and on my final visa run flying in from Penang they stamped me in but said I cannot do it again that year. Am sure things maybe even stricter now. Glad I no longer have to do visa runs.