There are plenty of free lunches. I pay for highways in Idaho I will never drive on, bullets that will never be fired, subsidies for buildings I will never visit or enter, administrators and staff for programs I will never use, federal agents I will never need, wells I will never drink from, trains I will never ride, etc. etc.
Don't say there are no free lunches, it just isn't true.
And depending on how the public option is formed, it won't cost you much of anything. Just because you offer an alternative doesn't mean it has to be a free alternative - the programs currently used in WC insurance aren't free, you pay for their coverage just like with anyone else and their rates are competitive, but not always the best - especially for particular industries. A public option can simply be that - an optional, alternative plan offered by the government that may/may not be an attractive option for some people.