If the chances of winning the UK lottery are so miniscule, 13.8 million to 1, how come over 2000 have won?

Assuming around 80 million tickets a week are sold based on website below, there should be 4 winners per draw on average. That means only 500 draws needed for 2000 winners. It's been going since 1994 so there have been at least 850 draws since there are now 2 a week. Probably less people bought tickets initially so it doesn't exactly fit but based on those numbers you'd expect around 3000 winners. 2000 is actually less than you'd expect.