There was a Sci-Fi book I read where this was a service provided to rich people. Basically you signed up for it, and you'd get a text when everything was about to go down. Time to drop everything and fly to your bunker.
Any chances you'll recall the title? It sounds interesting
This is essentially the premise to Fallout, or at least the leadup to it.
This seems like an area rife for a scam, like hurricane insurance or earthquake insurance. You pocket the money, and when disaster strikes, who is going to sue you when you do nothing? If there was a real bunker-worthy event then all your insurees have been devoured by zombies or dissolved by radioactive strings or whatever.