This is true. However, the point of these offers is to rope in people who think of credit cards as "free money." I don't think Wallaby will drastically reduce the number of marks for these companies, since the people using Wallaby are going to skew smarter.
Majority* of people I know that use credits cards and pay minimum required amount are not dumb people. If anything they do not have a choice. Living from payday to payday will do that to you. Unexpected event? Time to pull out that credit card. It sounds so easy to just bunker down and break the cycle, but then whammy unexpected event.
