You get nothing because longer lockup periods don't have value.

Longer timelocks have negative EV (estimated value).
You're begging the question by outright assuming longer timelocks good right at the start.
They help nothing and choke liquidity even more.
They punish users and will result in less demand for HBD.
It's taken me a long time and a lot of theory-crafting to come to this conclusion.
But hey I'm more than willing to be proven right if this is the chosen path.
The on-chain data will be incontrovertible if I'm correct.

APR on HBD should not even exist.

We should be allocating all that money to yield on a HIVE/HBD AMM farm to create actual liquidity instead of purposefully sucking liquidity out of the economy and calling it a good thing. This would create exponential liquidity and make Hive itself more stable instead of less stable (because the price is pegged by dollar denominated assets and only exponential dollars can move it).

Unfortunately I don't talk about this much because Blocktrades doesn't like it and says it's too risky. This is above my paygrade so I don't argue with him, but I also find it extremely suspect because there are potential conflicts of interest in play (like no more @hive.fund money for the stabilizer). It's hard to tell when politics leads to gatekeeping and self-preservation on Hive.