I was told a long time ago to cancel the tour if you didnt have any bookings before you left, even just one would do. I think its a load of rubbish. Many a time I left with no bookings then my phone would start ringing on the day. I think guys get wise to the fact that a lot of girls cancel their tours last minute and they dont want to be let down so they wait for on the day often.
I won't say it's rubbish...but it is partly true that many times I've gone on tours where advanced bookings cancelled, but I ended up getting calls from others. However, I would not risk myself going on tour with no clients. It used to work 2-4 years ago. But now, it would just prove far too risky to do so.
At this point, the only time I plan a tour or continue on from 1 city to the next, is if atleast 2 clients book me and DON'T cancel. That way, if 1 cancels, I'll have the other to fallback on in worst case scenario. I always think worst case scenario on tours these days because that's just how it is. It's very rarely a "wow I did better than I thought" anymore except when I went to San Francisco and Washington, DC. The only few remaining cities left in this dumpster of a country that you can actually go to and clients don't try to talk your rates down or complain about price and actually tip well.
Most tours lately, it's just been as expected, barely cutting it...or breaking even. That's when people don't cancel. Whatever I get before I arrive, is what I'll get when I arrive. And in America...there's so many touring escorts that they don't even care anymore who's visiting because next week, they'll be another batch of gypsies in town. When people do cancel, you can very well end up stranded and Lord knows...you don't want that.