Once you start winning small winnings in lotto then there are 3 choices before you:
1-You can let the amounts remain within your account so as to use them for further games.
2-You can play additional games and further boost your chances of winning.
3-You could do a good deed by donating your winnings to the red cross.
It is ultimately your choice although I prefer playing more games so as to increase my chances at winning more since I anyway know that 40% of that amount will go to charity.