Complaining about tipping on a article you have to pay to read is pretty funny. Tipping is widely preferred by the workers. That's why they don't do it in Europe ;)
On the contrary, I do it frequently and very separately from the bill. Of course, it is not yet embedded into the culture.
(Edit: quote the part I am responding to and remove some remarks.)
One can only hope it never embeds itself into the culture. One country in the world with this madness is enough...