Why not offshore? Several reasons.

In my particular case, I am not just the investor, I am the chief engineer and a principle fabricator. I'm not moving to Russia.

Working across a language barrier is very trying. I have had to do some graphics driver development work with far-east companies whose engineers only had minimal English, and it was a low-efficiency process.

Perhaps most importantly, throwing people at a project is not likely to get you a cheap design. It can allow you to replicate a proven design effectively, but you aren't likely to see innovation. The best way to get innovation is to have a system complexity that is low enough that it can be held in the head of individual smart people, which allows global system trades.

John Carmack