Hypothetically speaking, I could:
1. Buy RPG Maker MV for $80
2. Craft a storyline better than your typical mobile game, taking 3 whole seconds
3. Make a RPG using premade assets
4. Throw in a couple of songs not in the kit for flavor
5. Release it on the App Store, because you can legally release games made with the kit even using the kit's assets AFAIK - just read the terms
6. Probably make a thousand dollars or more, since the premade assets would be up-to-snuff quality, and since you're really not competing with much, even among other people who used RPG Maker
What are the flaws in this idea? It sounds downright evil and diabolical, because most of us or at least me have it embedded in our brains to actually try harder than a kit like RPG Maker, even if we fail badly.....
Let me list just the first few flaws that come to mind:
1. Coming up with a better story than average will certainly take more than 3 seconds. Are RPG story often quite... ehr... "limited"? Subjective, but I could agree in some cases. You can BET though that there is a reason why they are.
Lets just say, if YOU think the story is great, doesn't mean you find more than one guy that thinks the story is great. Subjectivity and all....
2. You will not make 1000 of dollars just like that. Not with games, and especially not in the mobile app stores.
To make money you first need an idea how to monetize. Premium games have a hard time nowadays in the app stores. Want to charge 1$ for your game? Good luck competing against the free to play games that look and feel much more premium than your 1$ game.
Then the whole mobile sector has become a shark ponds where only the big and greedy can earn good money. Everyone else is either lucky, or EXTREMLY cunning to even be able to pay the bills from the money earned there. It might be ironic, but it seems like the traditional platforms like PC or consoles have become a safer playground for Indies lately.
3. Using premade assets will not make your game feel more premium. Quite contrary. You can bet dozens of other geniuses like you had the same idea, and you compete with dozens of copycat looking RPGs now. They might have different stories, but the LOOK the same. Which to many people nowadays is a clear "no buy"... Steam gamers are complaining like mad about the RPGMaker Copycat games to a degree that even Indies that came up with good, original games have to fight the toxiticity.
4. Game development is NEVER quick and easy. If you don't believe, just try it yourself. I bet you will not get even a working prototype running before you quite with this attidute.
But really, go on, try it....
5. Maybe the biggest point of all... visibility. Nobody will buy your game if he hasn't heard of it. Just putting a Youtube video online is not cutting it anymore, ESPECIALLY if your game looks as coypcat as you describe it, and it is built with the love and care you seem to be ready to invest (none, to be precise).