Kishin Shoukan

hyper teles were available permanently via cash shop, the option was taken away in order to put them in the much more profitable wheel. you're right, it's not the same, but every new year they one up themselves.

The adding to Marvel was done years later, and I doubt any of the people who were at Nexon when the perma rocks were removed, were still working there when the rocks were added to Marvel. So one can't say the removal was done "in order" to make it a gamble item.

The perma version was taken away in order to sell the temporary version. Same as they did with the permanent clothing.
Which, I agree, was also a low thing to do.
But not quite as low, in my opinion, because it's removing a Cash item for another Cash item.