Yup. I live and boat in the SF Bay Area. Pittsburg is at the very upper end of SF Bay, where it merges into the Sacramento River and the Delta area. By car, in light traffic, it's maybe 30-40 minutes into SF.
Haven't checked, but am guessing that berth rates are probably a bit cheaper there than in the central bay or up in the Delta. As a place to live, it's also probably cheaper than closer in to SF or to Sacramento.
For a boater, Pittsburg is actually a pretty good location, nicely placed about half-way between SF Bay and the Delta. SF is one of the most scenic places on the planet to go boating, but frankly, there are relatively few places to anchor and/or go ashore. The Delta has something like 1000 miles of waterways, with gazillions of anchorages and funky marinas.
You could do worse, believe me!
Good luck,
Oldersalt