If it really was simple for passengers to reclaim their money, why has the amount left on dormant Oyster cards doubled in the last two years?

BBC: Unused Oyster cards valued at ?55m

After resisting for years, it has at last decided to accept credit cards other than its own at the till (a change that could cost it 3% of sales in charges).

ECONOMIST: Marks and Spencer

For the last few years, my sister and I have approached the holidays this way: I bought gift cards for her kids, and she bought gift cards for my kids.

FORBES: Wrapp: Zennstrom-Backed Startup Reinvents The Gift Card