That isn't scammy. In these sorts of RTS games there are build times. Its special to not wait on those. Remember the cheat code everylittlethingshedoes in WarCraft II? How is buying access to that scammy? You don't have to buy it - and you can play the game. No one is forcing you to buy it, just as no one is forcing you to play.
The entire game is structured around annoying the player into speeding up build timers and buying other resources via very expensive consumables.
They start out reasonable, seconds to minutes, soon a day or two, and quickly scale up to the point where everything you want to do takes weeks of real time. And that's before you get into the other resources required!
Calling CoC and its mechanics an RTS is an insult to RTSes. When I queue up a Portal in Starcraft 2, I do not wait for a full week with the option to spend $4 to finish it instantly.
And another thing, the "you don't have to buy/play it" argument is really non-sequitur when we're considering app store policies whose reason for existing is banning annoying behavior. The entire point of games like CoC is to manipulate vulnerabilities in the human decision making process for great profit. CoC is basically Farmville with battles, which is crap for the same reason that Zynga and all their "games" are crap.
A simple test: Could the paid consumables be removed and replaced with game-earned items only with no negative impact to the experience? If yes, the paid consumables are probably crap.
Ever think for one moment that a mobile RTS has a different use case and different market than someone who plays Starcraft 2? Don't you think there are more of "those people", than those that will be annoyed with week build times.
If these "RTS" (keep in mind, its just marketing) games are only designed to be played a few minutes a day, over weeks and months, it could be easily continually engaging. Much like a late night show or your weekly Game of Thrones.
For that reason, you probably aren't the target market. Having a fleet of IAP testers (who are humans and get sick, quit their job, change positions) that are fully trained in all the existing games as well as being experts in game mechanics and can quickly understand new IAPs and new game types as they emerge is a very myopic and naive view of the world.
The "scam" argument boiled down to its core is really a moral judgement. With that I'd say good luck attempting to scale that and not piss someone important off.
Clash of Clans is a good example, the "use gems to skip build timers" mechanic is revealed during the opening tutorial.