It's going to be more like credits that you spend in many ways... maybe pay-per-play, or per-minute or anything really. Only way to do pre-paid multiplayer online!
Say 100 coins for 10$! And then you need larger packs (1.000 and 10.000) for the crazy people. You'll be able to gift these too I'm thinking, otherwise the multiplayer part will suffer.
That’s still considered microtransactions, you can offer anything you want for sale in your game. Just make sure users are aware what they are buying, as dealing with money can get troublesome.
Also if you are replying to someone, it’s best to click the “Reply” button on their comment, so they get a notification. Otherwise it’s easy to miss replies :)
