The team has a number of advantages:

1. It is available on a per task basis, .e.g if your primary team is otherwise occupied or they could use support.
2. It includes people with significant training and R&D experience.
3. We've done it a few times.
4. Includes people with a diverse set of skills across all levels, i.e. we are not just a group of engineer consultants :-), like (...)
5. A variety of measurement equipment in order to check local measurements, e.g. grounding, isolation or system output.

The other why is why bother for which the answer is:

1. To work with nice people
2. On interesting projects
3. And be helpful