In message , at 13:10:12 on Tue, 22
Apr 2014 tim..... remarked:
I don't think it at all reasonable to compare machines not giving
change with the "penalty" for not touching in/out correctly

machines the world over don't give change because the effort of
stocking them with the necessary supply is prohibitive

There is, of course, no such problem with electronic money

Happens all the time with electronic money held by mobile phone
companies, 'expiring' under the subscriber's feet.
--
Roland Perry