All these 'lottery' style competitions annoy me. I'd rather there was a bit of skill involved. In reality there are very few such competitions. Great British Chefs (one of my favourite websites) runs a number of these lottery style comps. Given that its a gourmet cooking site I would have expected something with some cooking skills to be involved.
Professional 'compers' spend literally hours every day entering as many lottery competitions as possible - literally hundreds every week. They can do quite well out of it sometimes - law of averages I suppose.