When a common man does it, it's called bribery. When a lobbyist does it, it's a great law.
Most of the people listed in this article aren't politicians, and so can't enact any laws. And even when they are politicians, it looks like they are almost always retired politicians, who can't enact any laws. Some of them are even counter-establishment figures like satirists and even hackers (in the security sense). Hillary Clinton is a prominent example, but the article's explanation is that she is invited as a re…
They are connected individuals who will provide introductions, lobbying and favours for the people paying for the speech.
"but the article's explanation is that she is invited as a retired secretary of state, as other retired secretaries of state have been, rather than as a current presidential candidate, which seems reasonable."
This is really a little naive.
Hillary Clinton is running for Pres with a 70% chance of getting it, her husband is the #1 most connected man in the world.
Over 50% of the private entities she met while Sec of State donated to the Clinton slush fund, to the tune of over $57 million dollars.
It's a form of soft corruption - 100%.
A $250K 'speaking fee' is just another way to transfer money from an org, to a political entity.
A 'donation' to the Clinton Global Initiative is simply a donation to the de-facto Clinton PAC/fund.
It's a form of corruption and it's not a secret. You don't donate to Clinton fund - then get an introduction/favour by Clinton by accident.
I'm singling out Clinton because you did, but it's the same across the board.