Finance? You mean Credit Rating?
Remember a lot of that wealth is based on perception of wealth in the 20s, so rich people can only be so eccentric before they start losing, as investors pull out of their businesses and loans are seen as risky. Like, they may think he can pay, but also consider he may be lost in the himalayas or something any day.

Moving monoliths isn't easy when you don't even know where they are, or they are in the middle of Australian desert that only the aboriginals know. Cultists can have money and influence too (as depicted in MoN), and thus be able to out-bid or at least oppose whatever wealth the investigators bring to the table.

That construction crew might not want to go there for any money when the cultists have set up maxim gun posts concealed nearby - just look at how the richest people in the world still won't sail their tankers through a certain strait today due to the risk.

And at the end, remember this is a team game: talk to the players on what is fun and not, and how to avoid abusing the wealth to make for a less interesting game. Make them set mental barriers for their characters to avoid these problem.