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That is not a crazy idea because from what I heard, they always come to the graveyard and slept on a specific day. Their purposes are to get some of the revelations as you said. Some of them can hear some whisper that told a number, some of them can see a sign about the number. Many experiences from them but most of them are not share what they've got.
The old people who played traditionally gambling always did that to get the right number. But after that traditional gambling was prohibited, I don't hear some people are continuing to go to that place. Besides that, the generation of people after that old people don't want to follow them because they think that is ridiculous. They prefer to use the other method.
Well, that's crazy enough for me. If sleeping on a graveyard on a specific day to wait for a revelation that will come through a whisper is not crazy, I don't know what it is. A combination of horror and funny joke perhaps?
What's even funnier is that on the nearby graves, there are also other people who are sleeping waiting for that number whisperer. And what if they heard different numbers in their sleep? Or the other saw a sign of 45 when the one sleeping on the grave next to him dreamed of 28?
Some old practices are gradually dying because they are plainly irrational, no scientific explanation, no empirical proof, and most especially no one has become rich out of it. If that were true, they should have already won millions in daily lotteries.