Perhaps it's worth writing a quick blog about it? If this system wasn't documented before you purchase anything, you may even be able to get the attention of certain game review websites.
There are plenty of pay2win games out there, but if the game doesn't tell you that paying will give you an unfair advantage /or what advantage you're getting, exactly) I'd consider that worth reporting on, especially if the game has a decently large following!
Not much I can do with that data, other than sleep in comfort knowing that its the case.