So eventually you can recoup lost STX, provided you acquire NYCcoin. The other 30% of STX bids goes to NYC's treasury's wallet, the balance of which is publicly visible, in the proper spirit of blockchain.
And on top of all that, you can stack STX itself to get 10% APY in, wait for it, BTC. That is the central utility to STX, if I understand correctly. Haven't looked into how to do it, but I'm sure its simpler than this is.
So you can stack NYCcoin for passive income in STX, and you can stack STX for passive income in BTC. But again I haven't looked into the latter yet. Aside from this project, I am totally new to Stacks.