I'm at the stage now where if a company required me in the office, the surcharge I'd be asking on top of my wage (30% would do it) would be so hilarious that it would be insulting, but in my mind, that's kinda the point.
I don't think it's unrealistic to think you can get a 30% pay bump by taking another job, or that asking for 30% over what you might think is "fair market rate" for your skills is a bad idea