Sure, in a completely different system money solving everything wouldn't be a problem. In the system we've got, though...
The system we've got allows for financial warfare, is limited to a single resource roll per game, and can be enhanced by other effects (frex it would not be difficult to make a Resources enhancing potion).
Why refuse to use something that has the groundwork laid out, just because it isn't complete (yet)?
Especially given computer games are far superior at combat.
Finally, consider inverse what a financial plot would look like -
Molly realises that she can buy the town of Centralia in Philadelphia for a few cents per acre, use Winter powers to extinguish the burning coal mine beneath it, making a fortune and striking a blow against global warming. To do so she would:
talk to her dad as a business man to get a feel for what she should do,
get Justine in for handling the actual finances,
Thomas for sweet talking people into selling,
Murphy (and lawyers recommended by Murphy) for legal matters.
Plot being plot, she would end up needing to talk to Marcone.
Assuming success, and bearing in mind what she learned in Brief Cases, she could use her new coal mines as a springboard to invest in the military/industrial complex; here she would want to talk to Monoc Industries about what would be involved in using 'ferromancy' to win the war with the Outsiders.
This would be far more interesting than some gutter brawl.