The minimum amount of premium currency you can buy for Rivals of Aether 2 at any given time is $10 worth (1000 Aether Bucks). It's pretty predatory because if you want something that's 500 and something that's 1,000 you still have to buy $20 instead of $15.
What's worse is that, since you earn a little bit of Aether Bucks by playing the game, you're even more tempted to pay extra to help get you up to the amount to buy something that you want. Since that minimum is $10 though, it feels really bad if all you need is like $3 extra to get that skin you want or whatever. Speaking of the skins, they are also horrendously overpriced IMO.
This is what I don't understand when people shit on PSO2's monetization. You can actually just pay $1 at a time. That game is FREE too, not $30 up front like RoA2 is.
Thankfully it's all cosmetic and stuff, but still. It feels kinda' predatory.