It seems like the corporations were shook that Trump won and wanted to know what his policies would be. Would he really invade Iraq again to get their oil, would he fight the establishment by locking up Clinton.
Cohen and the other characters were close to Trump, so they were used(read: paid) to figure out what he was going to do while he was actually in office.
However, they soon discovered that none of those jokers had anything to do with policies (or knew what Trump was going to do and neither did Trump have any plans thought out).
This changed over the months, with different staff replacing the likes of Banon and Priebus, Trump actually figuring out how being president works and discovering it was better to work with the GOP than against hem.
Even if Cohen got paid to change Trump's position it would be a tall order to make the case that Trump changed positions based on those pay-offs and not just because he felt like it, was mad at CNN or Lou Dobbs, Roger Stone or Alex Jones talked to him on the phone.
It seems that from everyone in Trump world, the guy that stuck around the shortest (The Mooch) gets the most airtime on TV to give an insight in the Trump administration. That kinda tells you everything you need to know about how effective 'lobbying' Trump is through his cronies.
