What king does, and what is being called manipulation, does not result in satisfaction or good feeling. A person simply spends money in order to progress, but ultimately does not actually get an enjoyable experience or useful product out of spending the money. It's borderline gambling.
your comments about gambling are really cold and detached from the real world suffering that gambling addiction causes people and their families.
People attempt to construct this dichotomy all the time, but I have yet to hear of a decision procedure.
Gambling addiction is unfortunate, but completely irrelevant to this point. People get addicted to prescription pain medication, exercise, and sex, but I'm not against any of those things either.
Your counterpoint doesn't really hold any water. King might be sucking value out of manipulating customers into buying into imaginary value, but they are the far from the first successful company to do so.
You do not want to do it, it causes you a lot of problems and pain, and yet you find yourself doing it anyway. That is compulsion. Have you never once experienced this in your entire life?
Now you are moving the goal posts. So Versace is "fair" because of intangible feeling X, but Candy Crush isn't because of intangible feeling Y? For all you know high Candy Crush scores could be a display of high status on some college campus somewhere. Neither companies sell anything other than the feeling you get when you buy their product.
And is it really impressing other people that is truly the motivating factor in buying more power ups? Or is it.... the exploitation of bugs in the human operating system? The construction of game mechanics to manipulate people's emotions into doing things that don't make rational sense?
versace and cadillac rely on providing their customers a feeling of superiority and social status. cadillacs are arguably better engineered than other brands, but versace is clearly all about status.
i think it's a reasonable comparison, but as others have said, this is what most companies do anyhow.