Yes I saw there were other methods but I meant when you went to a machine and this was the only method left. Back in the 90s the landlords were often serving nearly all day (not like these days) so the risk of getting caught 'plugging' was surely high.
Mind you at least those machines booted quickly - these days they take minutes to boot and the digitals even longer.
I did like the lost boys (cloud 999) empty though because you could do one plug, make some profit and then (if too many people around to repeat the process) come back later and repeat, etc