I have a problem with that. It shows moral corruption. It's not corruption in the legal sense but outlines the issue of why the pardons do not make sense.

ex-POTUS is still an influential individual and is just profiting after the binds of the position are lifted.

I think it would be a pretty nice decree to disallow the president to become extremely wealthy X years after presidency. Let the influence slowly fade and let's see if POTUS as an individual, after being elected to do public good, can produce some value outside of benefiting from being elected.