Let me comment on why we did not implement a HIVE Engine token: The way all games on Hive are implemented today you need to rely on a central game server as Hive does not have a smart contract functionality. So even if we would implement a Hive engine token this would not change the risk that we shut down these servers - which we definitely not plan to do.
When Rabona was born, Hive Engine was basically a centralised service with no real level of decentralisation. This is the reason why we at that point in time decided not to do a token there as it would have meant that you add another layer of centralised services.
I agree that HE today is different from a year ago and we might at some point reconsider this decision. But this was the rationale why we did it this way.
RE: How SPS helped my investment targets on Leo, Hive and PoB