Elora, I would be EXTREMELY wary of this. I took a look at their Web site. First off, no one, no matter how much of an expert they are can claim to know the "true value" of an antique. Even the experts can only give an approximate value of what an item would sell for. This would change in a variety of circumstances. For example, an antique would sell on Ebay for one price, at auction for another, another in a retail setting and insurance value would be still another figure. There is no set price. Secondly, this site is charging you a L500 entry fee. Also be aware that when you win a high dollar prize, you have to be able to pay the taxes on it.
Perhaps I'm overly cautious, but it sure sounds like a scam to me. Anyone else have an opinion?