"So now the elected representatives cannot represent, because they are not expected to? Does this not make it very unlikely for any person to actually make an informed decision?"

You really have a habit of going off on some random tangent and misrepresentating what was said. The dynamic is different. You have a 1 to 1 vs a 1 to n (thousands to millions). This allows lawyers, the example you brought up, to interact in a meaningful and even educational way. The rules of professional conduct are also different, allowing politicians to do things lawyers cannot. If the people are educated, then they can recognize when they are being misrepresented and the steps to take to correct it. This might involve adding better candidates to the ballot or looking outside of the traditional 2 parties.

It's not the test, it's the education of the people. Passing some rule, as you suggest, isn't going to fix anything. It's not likely that the representatives will legislate away that source of funding without adding loopholes that benefit the party in power. Your plan depends on the same corrupt power hungry people to somehow oversee themselves and remove a source of their own power. So how do you see that actually working? Spoiler - it doesn't.