I'm sure there's a bit of that but I think for most companies it's a way to get the foot in the door at another company. If you think company B could use your

I'm sure there's a bit of that but I think for most companies it's a way to get the foot in the door at another company. If you think company B could use your services then company A can ask their board member who just happens to also be on company B to push for it.