My current company is paying 100%. The rates jump going from 1 to 2 people, and then again when you throw in kids. This has been my experience at most places, aside from the company fully covering the cost. The $820 number is entirely their contribution.
If we did have kids and needed them to be covered, we'd run out of what the company offers to cover up to ($10k / year) and have to start contributing as well.
I'm confused, wouldn't this be expected? More people, especially people who tend to make expensive additional people, would make the rate go up. Is your point that it went up more than double, instead of exactly double?
Wife and I are around $820 / month, and that's with a $5k deductible.