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Because time, petrol, car insurance, lack of funds in bank acruing interest. Also customer wants a fucking tap and trader did the donkey work of getting it and wtf that should be a zero cost service?
Edit:
I've had two batches of wood flooring turn up banana shaped. The fitters have been over 4 times and the flooring company are doing the graft to get me a decent batch of flooring. I still don't have a floor.I hope they charged a markup on the materials as it's been a shit job for them so far.
In that case I have missed something. I'm not expecting you to neccessarily pass on whatever discount you've negotiated with your suppliers to me (though it would be nice, and my builder usually does). Whatever markdown you manage to negotiate with them is at your discretion.
My understanding of this issue was that you have to go to a shop, buy a tap off the shelve and then charge x% on top of the tap's shelf price because... why? If you're simply passing on the retail price of that tap then there's no issue. In your example if you were charging £1.60 for the piece of wood that retails at £1.50 then I'd have to question that.