I got frustrated with buying crips from my local tesco and when I was charged 65p for a packet of Worcester sauce French fries, I decided enough was enough.
True you have to really like the crisps you buy because you are going to be eating them for a while.
True you have to have somewhere to store those bad boys because the box is quite big.
True you have to put up with people aying "I can't believe you bough a big box of...".
If you can deal with those 3 statements, then you shoudl buy a box they worked out at 30p a pack.
Mike