Partial refunds are dependent on the age of the account. Refund eligibility is triggered by major changes to the program. Since the last major change we made was at the time of Hive fork, only members that were with us before that are eligible to request refunds. That's quite a long time ago now.
There are a few whales that will pick up units in over-the-counter arrangements, and they usually go for around 0.50 (since each 1 HIVE creates 2 units). We have some long-term plans to improve liquidity of existing units, but there is not currently active development in that direction.
RE: Choose one of two not so common Splinterlands cards or 1 HSBI raffle #111 [en/de]