Toyota has had the biggest budget in Formula 1 for several years now and they're not even close to winning yet. It might take them 10 years to be a real winner. To get a new program "up to speed" takes years and years. Teams don't give away their information about how they do it, and it's always a moving target. The combination of improving technology that jumps up every year along with catching up to the other teams makes it extremely difficult no matter how much money you thow at it.
As an example, Toyota will sell cars even if they're a loser in Formula 1. Lamborghini is different. They sell only "fast sports cars". If they spent 10 years losing badly head to head with Ferrari, it could kill their whole company because their "street" cars will be confirmed as "posers" at that point.
