How is that? Walmart sells Visa debit gift cards too and says they can be used anywhere Visa debit cards are accepted. The registers at all WM stores are programmed to accept them. Why do you say that those who won't permit that are correct? That's not the official WM policy at all.
Can you go into a Post Office and pay to send a pkg or buy stamps using a debit card, 100% can you use a GC, But can you use it to get an MO,Nope
MG and WU both say the only DC usable is a Bank DC or ca$h. The csrs are the reps for MG in this case and simply are enforcing MGs T&Cs. , its rather plain and simple. Is it illegal to sell your AA miles, not at all, will AA shut you down if they believe thats what you're doing 100%, again thats also plain and simple