I was just in St. Maarten, rented a White I10 from Europcar for 1 week, (I think the license plate was 2531), and I noticed that the key did not work in the passenger door. Other than the fact that I could never open the door for my wife, I didn't really care, and just always locked/unlocked the door from the driver side. I never mentioned it and I wasn't charged extra for damages either. I'm just mentioning it since apparently it might have been used in the past as a scam. I wonder if it is normal, or at least common for the keys to only work in the driver side. (Maybe this happens when someone loses the key and they only bother to replace one lock.)
Also, I reserved my car on Orbitz and it was $10/day + taxes which came to $120 total for the week. When I got there, they had a sign explaining there is compulsory insurance. There were 3 different levels of insurance, and the one we were forced to purchase was the cheapest at $8/day. I still don't know if I was scammed or not, but at $18/day I didn't care too much, since it was still pretty reasonable. Though I did ask for the final price, and was told something like $250. After I questioned that, and explained I was expecting 120 + 8*7 = approximately $176, they then told me with tax it would be around $185, which I agreed to. One annoying thing was the preauth on the CC was $800. But after I returned the car, they charged just the $185 and the auth was removed.