Could always swap out the lightning bolt for a store that you can buy stuff with your gold you have in your pockets and/or sell other items to. I personally don't ever visit the lightning bolt anymore. Even a double sword encounter, at depth 4 is less likely to TPK my group than that lightning bolt is.
Yeah rerolling passives feels like a crutch at the moment. Maybe instead the building should be used to upgrade a passive, when you have the rarities. So say you have the common version (self only) passive. Upgrading to party passive costs say 1000 gold. Upgrading to the roster passive costs say 10000 gold. That way the building is still useful, but not in the way it is currently.
Not a problem. Thanks for the interesting game. As a game developer myself, its nice to find streamlined games and learn to improve my own games.