Skipping MSQ

[Jandor]

Actually it does. Because the only justification in the free market for offering your product is that there are people who want to buy it
Now it is a whole other can of worms if this is like say, customer friendly, good in the long term and so on, which are/can be debated, but its still justify it perfectly

Something being profitable does not in itself make it justified. Selling heroin is profitable, packing malware into your game can be profitable, sacking employees who get pregnant or fall ill improves profits. None of it is justified though.
The capitalist system, at its core, is morally questionable. It's about using the worst aspects of human nature to drive progress, it works, but only when Governments and customers work to keep it in check.

Oh, and while I think a cash shop in a subscription MMO is pretty damn shady, I obviously don't think it's of anywhere near comparable severity to selling heroin. Before anyone jumps on that...