I am going to offer some comments and observations here, even under the threat of alienation, because I think enough of the DR to do so.
As some of you know, I have travelled to the DR over the course of the past couple of years and have really come to love the island. Part of that has been as a result of the sense of freedom I feel when there, and part of it has been as a result of the really friendly and wonderful people I have met, both native and expatriate. The only thing that has bothered me has been the vendors, though I admit they aren't as bad as some other places. One place that comes to mind is Montego Bay, Jamaica. I was there several years ago and decided when I left that I would never return. I haven't, and I won't.
I firmly believe that the vendors have a right to earn a living, as we all do. But I think it's their approach to earning that living that is a real turn off for many people, myself included, though I don't believe that it will ever change. On the other hand, I believe that a vacationer has a right as well to enjoy their vacation and not be pestered by anyone for the duration of that vacation, if they should choose not to be. Most people who travel to another land do so, in part, to get away from all of the stress, pressure, and BS at home, and certainly don't desire to deal with it while they are on "vacation". After all, isn't the whole idea of vacationing to "relax"?
The impression that I've gotten reading through this thread is that those of you who aren't bothered by it or who, at the very least, don't see it as being a big deal, are those who either live there full or part time. It's great that over time you've either become accustomed to it or have simply learned the fine art of dealing with it. But, my understanding is that the OP was a first time visitor. Were I a resident and, particularly, a business owner, I would be extremely concerned. Tourism seems to be one of the primary industries for the island and if vendors, as well as those of you who live there, start to run these tourists away, I guarantee you that you will ultimately pay the price, not the tourist. That's not a threat, but a simple fact. Many of you who live there, whether you realize it or not, are in some way dependent upon the tourist.
And, finally, I think we would all agree that we are all entitled to our opinions. But, it is, I think, the "presentation" of one's opinion that makes the difference. Speaking personally, I do well with those who offer friendly and intelligent advice. I don't do so well with the name calling and belittling that sometimes takes place. And I don't mean that I curl up into some little ball and whimper either.
Talbot, though I don't blame you for being bothered by the vendors, I would strongly suggest that you give the DR another try as you would seriously be missing out on a great place if you didn't. There are places you can go where you wouldn't have these kinds of experinces or, at least, not to the extent you've experienced them in some of the places you've been. I would also suggest that you make some connections with people on this board who live there. They can show you the ins and outs of getting around and how to avoid some of the pitfalls of the island, understanding, as some people have pointed out, that there are pitfalls anywhere you go. Give it another shot, and if it doesn't work out, then maybe it really isn't for you. I wish you well.