What's the problem?
Also, if you want to get into a mobile game dark pattern try this:
- 100 coins 0.99, 550 coins $6.99
After you buy 100 coins pricing switches to:
- 100 coins 1.49, 550 coins $6.99
Usually you have mechanics like that with pseudo currency, not actual $ because it is too obvious. But understand their are no accidents in pricing at that level of development.
0.99 * 6 = 600 Pokecoins for $5.99
550 poke coins is $6.99
So more money for less tokens when you buy 'more'