I like this idea. The only thing I would change is that advertisers should pay in Hive. Funds coming in should pay Hive. Funds going out should be in HBD.
I think the true price of a currency is in most part a reflection of the goods and services which you can buy with that currency. We need more goods being sold in Hive. HBD works too, but it's more of an indirect influence. Right now the only real commodity that we produce is a small amount of attention. I think a game could be a good source of revenue if it could ever be successful, but if we wanted it to drive the price Hive, it would have to use Hive as the currency. We've seen through Splinterlands that a game is capable of garnering players outside of Hive with lackluster benefits to Hive itself.
This actually spurred my own conversation with Grok in which I came up with a pretty good idea. I'm kind of excited about it actually.