That's the whole basis of 0% cards. Lend money to Paul for peanuts safe in the knowledge many will forget to repay or be unable to and take a fortune from them. I know banks are cynical but these cards take it to extremes.
Yes
I used to work with a very clever bloke who had several cards all maxed out
him and his wife realised that they were being stupid
About then someone tried to persuade him to take out an interest free loan to pay off all his debts
he went through it with his wife
then brought it into work and we looked at it all (it must have been a quiet time !)
basically, he couldn't see why they were offering it to him
it seemed like too good a deal
until we thought about "people"
and realised that it was alls et up for the debtor to miss the critical deadlines along the route
a certain percentage HAD to be paid off after 6 months and then every year there was a percentage
and teh percentage numbers were no simple numbers - things like 34% rather than 1/3
it was a great deal - but designed to make "the normal man in the street" get confused
he went home and signed up
but set specific and detailed target on his computer at home and in a prominent place in hs kitchen
and paid it all of when needed
after 3 years it was all sorted
when he told us we asked about reminders and all that - he had not received a detailed reminder in the whole 3 years
just woolly things about remembering to meet deadlines
it saved him a fortune - because he went through the T&C and stuck to them