Lots of pretty girls to pick from. No lack of good choices in Boston. Black, white, yellow, red...any flavor you want. They will kiss you, suck you, kick you in the balls, or walk you around like a dog on a leash if you want. I've heard a lot of stories and done a few weird things myself I must admit.
I have family in Boston, so I return a couple times per year either way, but Boston is almost always a good experience for me. One thing I've noticed is that I'll often come to Boston with only a couple of solid appointments booked but then my schedule will fill up once I'm actually in town. A lot of ladies don't like that dynamic and may cancel tours or choose to skip town altogether if they aren't receiving advance bookings, or their advance bookings are canceling on them once they arrive or a few days before arrival.
An abusive client can absolutely keep a lady away from town. For example, I visited Miami 6-9 months ago and I wanted to return there a couple months later, but I decided against it. I had met an abusive client in town (rare experience for me these days), and only with great difficulty had I extracted myself from the session at the end of our appointed time, much to his protest. He was trying to throw a pile of hundreds at me but the situation was so bad that I actually just HAD to leave. I made some excuses/apologies and in his follow-up emails he said he wanted to see me again next time. Since I had no intention of booking with him again, I decided to wait until it had been more than three months since our last meeting to go back so he couldn't decide to write a vindictive review once he realized I wouldn't see him again.
A slow week can also make a lady much less likely to return, of course. Although some of us DO love what we do, we definitely aren't out here slinging pussy as charity either... Gotta pay the bills and cities where we lose money or spend three days in a hotel only to break even are no generally places we are eager to return to.
And then there's the weather right now! Boston is freezing! IDK about everyone else, but my ass is in the Deep South where it's warm right now! Yay New Orleans! 
I'll be back shortly after the new year, though, and I'll do my best to bring the warm weather (or at least my warm ass cheeks) with me!
What I've been told keeps some providers away is the lack of guys willing to book in advance, combined with the high cost of hotels. Between airfare, hotels, and advertising, they're investing over $1,000. Many providers want to be assured of a good return on their investment before committing to it. Boston has a reputation for not booking in advance, and last minute cancellations. I've experienced this myself, 75% of my appointments are same day, or one or two days in advance. If I were traveling, I know that would make me nervous.
