In theory.....

[alcozar]

I spned £10 total on the 2 UK and Euromillions draws and some people would think that is steep,

Maybe some bored millionaire/billionaire/company could put your theory to the test!!!

[olw]

Ok, this is called a brute force attack. It should happen only in theory.
When the jackpot is huge, and the lottery has few numbers to combine, in theory you may buy all possible tickets and get to double or triple your investment.

However: There is a case of a documented brute force attack.
It happened in Ireland Lotto in 1992. Read below (from Wikipedia: )

===
In a 6/36 lottery, the odds of matching all six numbers and winning the jackpot are 1 in 1,947,792. At Lotto's initial cost of £0.50 for each six-number combination, all possible combinations could be purchased for £973,896, which left Lotto vulnerable to a brute force attack of the kind that happened when the jackpot reached £1.7 million for the May 1992 bank holiday drawing. At that time, a 28-member Dublin-based syndicate, organized and headed by Polish-Irish businessman Stefan Klincewicz, tried to buy up all possible combinations and thus win all possible prizes, including the jackpot. Klincewicz's team had spent six months preparing for the brute-force attack by marking combinations on almost a quarter of a million paper playslips.

The National Lottery tried to foil the plan in the days before the drawing by limiting the number of tickets any single machine could sell, and by turning off the terminals Klincewicz's ticket purchasers were known to be using heavily. Despite the National Lottery's efforts, the syndicate did manage to buy over 1.6 million combinations, spending an estimated £820,000 on tickets. It did have the winning numbers on the night -- but two other winning tickets were sold, too, so the syndicate could claim only one-third of the jackpot, or £568,682. Match-5 and match-4 prizes brought the syndicate's total winnings to approximately £1,166,000, representing a profit of around £310,000 before expenses.

Klincewicz later appeared on the television talk show Kenny Live and capitalized on his short-lived notoriety with a self-published lottery-system book entitled Win the Lotto.
===

Interesting, uh?

[Scott]

would be a lot easier now though.. you could just automate it and buy all combinations online..

Jackpot rarely gets above £15m now days though so brute force isnt worth it