Thing is the big guns (life assurance, banks, syndicates etc) buy up huge quantities of these even for short term investments as they are guarenteed to get the money back and may win something), so means the small players are not the only ones in the pot. These guys buy up millions at a time....though the odds must be better than the lotto as you never hear of them (banks & the like), buying up loads of lotto tickets.
On saying that...I've never known anyone who has won (and my parents & aunts all would have had loads....my job was to check the numbers)