Would you ever approve signings if you were the chairman? You could conceivably make such a flaccid and useless point about any player in the league or in the world. I know you are just a wind up artist most of the time, but making a point as "well, he is gonna be ****ing ****e until I see he is infact a good player" isn't a point, it isn't a prediction and it isn't anything you're right about.
I understand your core point, selling a player is conceivably weakening yourself but at the same time... Perez had his buyout hit and Rondon was not our player and is getting old. I would rather just wave goodbye to Rondon and look at a younger option, we have done exactly that... in pretty quick time. If we sign Maxim we have sold two players and replaced them with younger players who have bags more potential than either. That IS good business.
Now, could they transition poorly to the league? Yes. But that is the risk you run in signing players, pointing that out and saying they're simply **** and you don't think they're good until they are visibly good is just a waste of energy typing. Everyone knows that and everyone thinks it.