Its just money saving ex put me off; their calculator basically puts my odds with just 100 so low I thought 'why bother'! But then you have to be in it to win it, there’s nothing to lose really.
Wherever you place £100 you're not going to get much interest on it, (or lose much interest either) so if you fancy a gamble there's no reason why you should buy some premium bonds. However, for larger amounts of money it's almost always worth putting it somewhere where it will earn some interest.