Will using credit cards at vending machines make you spend more?

Did you know that you can now purchase from vending machines using your credit card? Some machines with credit card swipe facility have been installed in Dallas, New York and Chicago for testing purposes. The big question is that how this will affect spending at vending machines. I think the spends will definitely increase, since most people don't think too much of small amounts, not realising that smaller amounts add up to huge spends over time. Machines that were installed in January already have higher sales, from 5-35% higher, than before. The vending machines with credit cards have been installed in areas where there are likely to be adults with credit cards, such as the Dallas City Hall, convention centre, hospitals, colleges and recreational facilities such as the ice rink.