What a remarkably stunning degree of ignorance, and also an exact match for the message which is hammered home in the various media.
You seem utterly unaware of how grants fund a great deal of academic research (and the funding in the field of 'climate science' is enormous.) You also seem unaware that many professors make a good bit of their income (a majority in some cases) providing services such as being expert witnesses. This is the case with one of my relatives. There is nothing wrong with that, but there could be in some circumstances absent proper procedures including transparency.
Again, I am just going to address your opening and I am going to assume that the rest of what you say is built up on the same faulty logic.
Okay, so first, just to be clear earlier when I said "my friend gets $10,000 per article" what I really meant is.... it is me. I am a professor, so you don't need to school me on how the game works. I have been in it for a long time.
Despite your delusion that the whole of academia has been bought out and all are corrupt, let me try to explain to you again how it works.
Yes, you are right there is lots of money that goes into climate science, but it will only go to the top 2-3% of researchers at the top universities. Nobody is giving big grants for your average state school or lower. Big grants usually only go to the big schools with big names. And no matter how much money you think there is, there isn't that much going into it. And next, after that money is given to the profs it isn't conditional. Once the profs get it, its theirs. They can publish any finding they want regardless of who gave them the money. It isn't like the grants come under the stipulation that their findings have to meet the donor's vision or else the researcher has to pay it back. Almost all of the profs getting big grants also have tenure. They don't really care what result their donor wanted.
And yes some professor's make a good bit being witnesses, like about 0.5%. The ones that do, can get paid quite well. The other 99.5% get no gigs. It is much like being a musician. When you make it big, you are set, but the rest stick to their day jobs.
The best way to make money outside of the university is a way you didn't mention. The most common way to earn substantial cash is to become a consultant for private industry. While I don't have any close relationships with anybody that made it to the rockstar level in academia of professional high paid witness, I do know quite a few that have gotten rich being consultants. And of course we know that the private industry in the global warming debate that would hire said profs are the oil and gas companies. They have very deep pockets to hire consultants. Yet only 3% of profs are global warming deniers.
Your narrative sucks.
You remind me of Fox News. Lie as much as you can and then accuse the other side of lying. Stall as much as you can and then accuse the other side of stalling.