The AI should have more diverse strategies

[Dolehof]

I've check the XML files and it seems the AI companies do have different design preferences set there. I guess the problem is they still all prefer high volume over high margins, that's why Marlin Aston makes sport that cost 555 to produce. It's a shame, because I tried and it's perfectly possible to run a profitable company selling only a few cars at very high margins if your cars are good enough.