The issue isn't that the wealthy don't pay their debts compared to a normal person. The issue is that wealthy people in nearly all circumstances have put a large part of their personal wealth beyond the reach of creditors through legitimate and less legitimate means. Very few wealthy people exit bankruptcy with no personal wealth because of asset transfers, trust structures, pensions etc etc . Wealthy people also have no problem running up large legal bills to contest bankruptcy at every opportunity. Often in different jurisdictions. For Banks to recover debts of wealthy individuals, they often have to fight their way through multiple layers of financial and legal complexity and they often don't have the stomach for it.
The only reason that people like David Drumm, Sean Fitzpatrick and other bankers got chased like they did was because it was a political imperative to be seen to do it. Having said that, when you read stories of some developers like Gerry Gannon and Sean Reilly to name but two and see them carrying on like nothing happened, then I can see why people wonder..... I have no doubt that in time, we are going be setting up a Tribunal to deal with NAMA and how it dealt with the loans and developers.