It's absolutely remarkable that a company as sophisticated as Amazon funded this gravy train year after year.
But what shocks me nearly as much is that they never tried to reform it before axing it altogether. Why not limit the free transfer to say, 100 bucks, with a marginal fee, say 1% for $100-1000, and measure the response? I'm sure this was a useful service that generated brand loyalty with a lot of people, why let the miles hobbyists ruin it for everyone?