While the airlines do some crazy things, this is not one of them. To simply repeat your original wrong notion, parrot a single post about "no logic", and ask about credit card EQMs (just a tiny fraction of the miles it takes to qualify) does not really address the issue that you wanted explained.

So I'm afraid you're just going to have to settle for not getting it; as Einstein said, "Make things as simple as possible, but no simpler."