Daily rates are cheaper to rent for a few days. More expensive for a single day rental. My guess is multi day rentals are more common than single.
I see 3 rental segments:
1. People who want to try a bike they're interested in buying.
2. People visiting California who want to do a motorcycle road trip.
3. People visiting California who want to do one or more day trips from the Bay Area.
You can't cover the 1st thoroughly.
A bike like the Multistrada 950 the OP mentioned covers the the last two pretty well. Good for trips long and short. Ditto for the Versys. The R1200R as well, but I think some riders are afraid to tour naked.
One segment that's hard to cover is visitors who want to do a 1-way road trip, but I'm sure I've read of someone arranging that through the bike owner.