Not at all, because there are thousands of other companies will to do this too. Its a sellers market, and engineers can literally get a job with a week's notice (plus maybe 2 weeks to get the visa sorted out).

> At your 6 year mark, where the green card has to be filed for you to stay in the country.

Green cards take time and should be planned years in advance. Don't work a H1B job without negotiating Green Cards.

I agree there is a time where you are unable to move during this time. I don't believe that good companies are going to mistreat their employees during this time. Similarly with your last point, the prevailing wage is irrelevant because there is high competition.

> horror stories I've heard from h1-b workers at some of the body shops

I think we disagree because we're coming from different perspectives. I think you're looking at the body shops (which account for half of the H1Bs) and where everyone has heard horror stories. Those H1B employees might believe they are beholden and stuck, but the truth is they are not. Move out of New Jersey, come to SF and you'll find the streets paved with great working conditions and employers who pay and treat you right.

180 days post application not a year.. This is well known and established, anyone applying for permanent residency should be well aware of this and should apply as soon as acceptable if they wish to stay in the US long term.