I've been using uber quite frequently.
Love the service it's so easy and each driver has been professional.
But, as for what you earn I've read it's about 10 an hour. There are posts online about this- see reddit.
Also, there are many more drivers on the roads nowadays compared to when it was first rolled out, so drivers have explained to me that pick ups are slower due to the increase (iie more supply)
As for insurance I have no idea. I've wondered myself riding in the cars, but for the most part I've been on short trips here and there.