I was once told by a Times employee (enrolled on the same car maintenance eveningclass as me) that sackfuls of unopened crossword entries got shredded every week. Despite this, I still submit the occasional entry, winning very rarely. And getting a letter telling you you've won, doesn't always mean you have!
Last Christmas, the Times wrote telling me I'd was amongst the winners of their Christmas Jumbo Crossword Competition and that my prize, a pen, had been ordered, and would forwarded shortly. A few days later, I got a letter from their Competitions Editor saying there'd been a mistake. That the person who'd written to me I'd won, hadn't realised that there were only three and not four prizes, and that since mine was the fourth correct entry checked, it did not qualify for, and I would not be receiving a prize after all!