Does it ring a bell?
It's kinda the use of Bitcoin is much comfortable since we just need a Bitcoin wallet and internet connection to make the transaction.
And in gaming: we just need a mobile phone where it is easy to access anytime and anywhere and play since you just need your mobile phone, no need to bring your console/PC desktop every time just to play.
Have you ever paid for games with bank account? On platforms like Steam or Gog, you just save your credit card number and when you do a purchase, you just need to make a quick confirmation and then it's instant. Or alternatively, you might go to your online bank site and easily send money to your game store wallet. It's really not much harder from sending Bitcoin.
On mobile platforms, there are also payment methods that make paying just as comfortable as possible.
So, since paying is not much of a problem, people won't see a reason to own such heavily volatile currency just to save a few seconds during their payments. And don't forget about 10+ minutes confirmation time, vs instant payments via banks.