My partner and I as well as some friends of ours tend to be safe about getting a cab when we want to go out on the town. It's a lot safer and the money we spend splitting a cab is about the same as we'd pay for parking nowadays. The only time I've had a not so good chance at getting a cab was recently and we were told that there were no cabs servicing the area where we were - which was Greenlake. Strange.
But, that's only one of a couple of times in the past several years where that has happened. Most of the time the drivers are in the highest density places and times of night when people are looking for cabs. With so many people going out more and more I'm wondering if we'll need a bigger fleet of cabs before we get more mass transit services.