You miss my point.
My interpretation of the evidence is that 41% happily admit it. And another 50 plus pretend they don't. A few are unlucky as you say.
If this were not the case, those 50ish percent would stop doing it. The fact they keep paying these fees tells us one of 2 things is true: EITHER they are honestly not capable of managing a current account OR they (like the 41%) choosing not to but are conditioned not to admit it.
Personally I find the second option much more likely.
The same is true in a lot of other pieces of evidence: people routinely vote against their own interests for instance. And they knowingly eat food that's bad for them despite being offered alternatives.
This is a fundamental part of human nature no one wants to address: people are not logical, dispassionate, long term thinking, selfless, analytical, strategic entities. They do dumb shit that is bad for them. And then they lie about it.
"Lie" might not be the right word, people will claim passionately they want X then do Not X without a moments hesitation.