If you look at it logically in the way that you pay a £1 to win a possible £10 million. you should pay another £1 to win a new possible £20/£30/£40 million.
plus the extra £1's you have to pay again make your winnings even more than they would have been if nobody paid their £1 again. and the rollover amount would be the same as it was the week before.
If you'd have thinked about it before I told you. you wouldn't be asking