That doesn't make sense.
You have a poor/no credit rating so they give you a card which could quickly get you into problems due to its high APR.
I don't think you've really thought that through
they give you a card with a very low limit and place you in the pool of people they deem high risk - the high APR is due to having to cover this risk but given the low limits they can reduce the people going into silly amounts of debt.
I doubt they really care too much about it tbh.. for banks it is more of a product that is there so as to not lose customers rather than a big money earner.