Don''t feel badly, we have all gone through this process before - many times. I was just passingly interested to see the type of boat you had - in that "would it attract any more attention" than the others around you ?
Its all a part of the learning curve in 3rd world countries. As discussed above, all whites in these areas are considered rich & in many areas to be milked at any opportunity. Obviously, this is not true of all areas - but it should be in the back of your mind.
Its just that over time in various areas, you will come to know what is an acceptable amount of graft, and typically, this is usually a "negotiable" process.
Anyway - the incident doesn''t look like it has dampened your enthuiasm - good deal !