When is it OK to say, "It's Not OK"

[NyarukoW]

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You're basically saying anything at all that is exchanging a service for money is ethically wrong. ...

Way to go at making up completely nonsensical interpretations. See:

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There are many things that can be sold in game and in real life. Just because people are willing to pay, does NOT make it acceptable....

Just because people are willing to pay does not make it ethical or unethical. You are ethically challenged, so you think anything and everything should be bought and sold with money. But civilized society has laws and regulation, just like games have rules, both clearly stated and unstated societal norms socially enforced, because having everyone freedoms protected by having order and stability is better than anarchy and chaos. It is only reasonable that civilized society should have rules that sort out contentions between conflicting interests, and not all trade and exchanges are acceptable if it is harmful to the society, in this case the game community.

BTW you've shown that you like to take nonsense extreme positions. Example:

...If DPS has to hold back, tank is bad...

It is a team game, people need to play together and adjust and adapt. Similarily, not everything should be up for trade and exchange. SE has actually has built that into the game and is basically forgotten and take for granted, considering how much gear is actually untradeable.