Of all money spent on National Lottery games, around 53% goes to the prize fund and 25% to "good causes" as set out by Parliament (though some of this is considered by some to be a form of "stealth tax" levied to support the National Lottery Community Fund, a fund constituted to support public spending). 12% goes to the UK Government as lottery duty, 4% to retailers as commission, and a total of 5% to operator Camelot, with 4% to cover operating costs and 1% as profit.
So at best you're getting a -47% return on average...
Last weekend the prize rolled down so lucky dip winners got a fiver as well.
https://www.national-lottery.co.uk/results/lotto/draw-history/prize-breakdown/2692
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So at best you're getting a -47% return on average...