I kinda like BBR so I was looking for ideas on how to encourage miners to hold onto their coins and network control via compound interest seems like something no other coin anywhere has.
Miners will be selling regardless, they have bills to pay, they hold some percentage only if they see great potential in coin, but majority of miners are just moving from coin to coin. Mintcoin is example of a coin where you get interest for just holding the coin in your wallet, this idea just doesn't work. It is idea where you get something for nothing and this is economically unsustainable and creates imbalances and in time it gets out of control.
The problem of BBR was that there was not enough buyers, now this has hopefully changed thanks to James involvement.
Solution to your problem is simple: find more users of BBR. This can be done through commerce, recommendations to others, free BBR if you do some stuff (maybe tweet about bbr, download wallet and install on your computer and give address, miner create your alias and you receive free bbr),...