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HarryI collect many different things and baseball cards (and maybe coins) is the only collectible that I can think of off the top of my head where restoration is so controversial. It is acceptible in antique cars, furniture, photographs, jewlery, watches, advertising signs, etc. Heck, even within the sports memorablia hobby, restoration is acceptible in jerseys, display pieces, bats, books, etc.
Obviously, the most important thing is that it must be disclosed.
I am also under the assumption that most professional restoration on paper products can be reversed if desired.
I would not mind having an item with light professional retoration. I would much rather have a card with a light color touch than the same card with a big scratch on the player's face.
Every collector will have to decide for themselves, how much is too much. For many, the answer will be zero while others will not mind massive amounts if the piece looks better.