Perhaps in the use of BGA's etc. (in more complicated units), but the profit margins are much healthier
We do small scale design and production, and repairs, for the Water Industry - and profit margins are great!.
Repairs are an issue, as there's no data available on other companies products, and they also refuse to supply spare parts.
For example, we had a faulty Vu meter on a ground mike - nice simple repair, except the manufacturers wouldn't supply us with a new Vu meter - you have to send the entire unit back to them, and they charge a fixed £1500 repair fee!!!!!.