Since you ask, it's because I'm a confirmed and hopeless cheapskate. I regularly walk an extra quarter mile to buy milk thats 15p cheaper a litre. After all, that saves me at least £20 a year ...
I know just the site to indulge ur cheapskate tendencies.....not necessarily 4 ur asdl answer (tho they do have a thread on that too I believe)
www.moneysavingexpert.com I have saved a fortune there using some tips/info, especially the www.call18866.co.uk phone one @ 1/2p per min ..24/7 ..uk and 1p per min ..24/7 most of rest of world