Why the cash shop hate?

[Sadana]

It's like having a magazine subscription and, after a year, not being able to see the pictures unless you pay $1 extra for each one. Sure for some people it's no big deal; for others, they got the subscription for the pictures and are feeling REALLY let down over this change. They wonder, "What am I paying for, then??"

There is also the "slippery slope" or "snowball effect" feeling of impending doom that some folks get. They may wonder, "Is the game actually doing okay?" since, in other games, a cash shop appears around the time the game goes F2P/P2W. And usually, the community is different (for the worse) in F2P games. No one wants that.

Those are my guesses.

[Chaytel]

It's like having a magazine subscription and, after a year, not being able to see the pictures unless you pay $1 extra for each one. Sure for some people it's no big deal; for others, they got the subscription for the pictures and are feeling REALLY let down over this change. They wonder, "What am I paying for, then??"

This analogy is inaccurate. A better example would be:
It's like having a magazine subscription and, after a year, they also release a collection of additional articles with other pictures, which can be purchased individually if anyone is so inclined or interested in one or more of these articles. At the same time, they also continue to release the magazine as always, per your subscription, with new pictures there as well.