Don't know for sure
Malibook, I never made an effort to try and determine whether or not the tab had been padded because I figured I'd be on the losing end no matter what. So, when I travel I just pay the bills and move on. But I just thought it odd when they'd insist on running a tab as opposed to my paying per round. Another thing they did that made me wonder is when they'd bring drinks that I had not even ordered. In fact, at one point I had to tell the guy not to bring any drinks unless I specifically asked for them, otherwise they'd just continue to bring them to the table.
And, MD, I don't believe either that this type of practice is exclusive to the DR. That is why I asked if it was typical in the DR as opposed to being exclusive to the DR. I have noticed this practice in Mexico also. I, too, have been to some places here in the US that are highly suspect as well. The only difference, I think, is that when in the US you, more often than not, have some sort of recourse when there is a problem. In the DR it seems that you are really at their mercy, and mercy seems to be a novelty idea there.