Lyft from MV to SF is like $100 I think? It's definitely not enjoyable but for Bay Area prices it's not ruinously expensive.

You /should/ be able to save by using shared rides, but in practice when I tried the driver was so mad they just dumped me on the side of the road and I had to call and get a refund.

The new Caltrain schedule isn't half bad though, if it came twice as often on the weekends we'd be cooking.