I suspect Lasciel would already try to kill everyone Dresden likes on principle for keeping her captive if she ever got out.
Antagonizing her is barely going to make things worse.
1)Lasciel the Temptress was infamous for wanting partners not dupes.
Thats the norm for most of the Fallen actually, because partners allow you to project a lot more power than dupes do.
Only brutes like Ursiel attempt to dominate their mounts and it generally resulted in much weaker Denarians.
Furthermore, its worth remembering that its often the norm for Fallen to spend years between hosts after their previous hosts get killed, as either the Church holds the coin, or another Denarian holds it until they find someone they think is suitable.
Its 7 years between Harry turning in Lasciel's coin in White Night and Lasciel showing up with Hannah in Skin Game.
Lasciel used to be an angel. Her sense of time is not likely to be calibrated to mortal sensibilities.
2) There's still a difference between being a target of opportunity and a priority.
It is far faster and more profitable to have a demon in the exchange. Setup a few dozen dummy account with brokerages and you can make millions just form knowing the markets direction.
And if we want gold we wait until a flood, then go to a river and use TTC to turn the thousands of pounds of dirt being displaced into a giant gold extraction operation. Probably clear millions of $ worth of gold of micro gold for day's work.
No its not.
We do not have the infrastructure to do high frequency trading, and without that, a cyberdevil is not going to provide you information faster than simply watching the Dow/S&P ticker.
Furthermore, the SEC does watch for, and launch investigations of, people whose trading gives signs of insider knowledge. And they have decades of experience at it. Nor does Molly have the Finance or Larceny dots necessary to do financial crimes and get away undetected; she wouldnt even know how to open a brokerage account without going through a tutorial.
Its not in our PC's technical expertise, let alone her moral comfort zone.
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Why would we do any of that?
If we can do nuclear transmutation, we do it at our timing using raw materials we buy at a store.
A ton of gold is easily twenty million at 2006 prices, and is readily fungible.
Because the lottery is a lot of money all at once that makes us visible to interested parties.
It also makes it easier to trace what we're doing financially speaking in a lot of ways. Smaller amounts moving through a lot of systems without direct connection to us are easier to hide.
The United States Treasury tracks and logs all financial transactions above ten thousand dollars in the US banking system, and law enforcement tracks even more financial flows via FINCEN. Plus there is your legal declarations to the IRS.
There is no situation in which we can achieve financial stability without coming to the notice of interested parties.
The point is not to be untrackable or unnoticeable. Its to not show any obvious signs of criminal or otherwise activity that draws sustained scrutiny. Anonymity is to raise the threshold of competency for such actors, so we dont have burglars following us home from the bank to break into our apartment or scammers falling on our car hood and then suing us for hitting them.
Molly walks around with the magic signature of a miniDarkhallow.
We arent subtle to interested parties who have the eyes(or other sensors) to see, and we wont be unless we bother to invest in the charms and abilities to help with it.
Clued-in people will suspect we did something. Doesnt matter. We're not repeating the same trick.
We've exhaustively covered why gold and gems are difficult to use long term as sources of wealth.
The stock market is tempting, but starting there might be a mistake, due to how much navel gazing is involved in their operations.
I did probably get ahead of myself though; this is likely a little too parasitic for Molly's comfort.
We really havent.
They work fine. They work even better as mediums of exchange outside of the financial system; at least, gold does. We know Dresden has collected his wages at least twice in gold when he did work for Strength of a River In His Shoulders, and Marcone paid weregild to the Fomor in gold.
The stock and bonds market is where you park money that you've already made elsewhere for a steady return.
Its not where you make money.
Not unless this is your career. And its not Molly's career.