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Nowadays a lot, but not all, of the inks are different, usually dye based, so it depends.

Depends on the newspaper, or to be more precise on the ink. In the days of old it contained iron oxide as a pigment, so that abrades steel at a reasonably fast rate.

Yes, you're paying mostly for the skill, and much less for the equipment, although if you want to, your razor probably can be finished on a $500 rock. As I said, do some reading, try it yourself, and...

Chances are your Dovo needs a bit more than stropping. At least any Dovo I've seen that came straight from the factory needed it.
If I were you I'd send the razor out for honing to somebody who's...