Good for mail order but not for shops

[thirdprize]

The whole thing about making a payment and then having to wait while it processes means BTC will never take off in the shops.  It is bad enough when you pay by card and the handset takes 20 seconds before saying "Authorised", but having to wait half an hour?  You could get away with it for mail order as there are lots of delays built into that model.  

When you pay by card, there is a fee involved and the shops usually covers that.  Would the same work with a shop?  Buy an item for £100.  POS software says transaction is £99 plus £1 fee.  You would want the fee as high as you can manage (to reduce waiting) without eating into your profit margin.  Big stores could write it off.  Maybe BTC shops will say "buy now & collect later".