Even for a famous team like Ferrari, they barely hover around the profitability line.
The best way to share the operational costs undoubtedly is to find customer teams.
Providing the other party with engines, gearboxes, and even technical support for the chassis.
The more customer teams there are, the less the various research costs are distributed, which is why the Ferrari Team actively helps HRT. Trulli and boss Kalanbant don't actually have such great influence; they act more like intermediaries.
The core factor is that HRT will become a customer team of Ferrari.
It's similar to how Ferrari has Haas and Sauber as customer teams, and even the Cadillac Team, which hasn't yet entered the F1 Paddock, will be equipped with Ferrari's power units.
Under normal circumstances, the customer team can't match the main team, as the power unit needs to be paired with the gearbox and chassis for tuning, giving the main team a natural advantage.
