Well considering even if the person farmed 10,000 gold a week on average (good luck with that in vanilla and TBC) it would take 300 weeks of non-stop farming (5.77 years) at that rate to meet that volume I would say most likely yes.
Given the only 2 real alternatives are:
- The person is somehow a god on the AH and has 3 million gold as disposable income (unlikely, not everyone can “win” in the AH. This is a ficticious scenario GDKP people being up thats never actually had proof).
- The person joined in GDKPs for years and stockpilled gold (the most likely alternative). But remember blizzard themselves, gold buyers/sellers, other players, etc have all stated seeing direct ties between Gold buying/selling and GDKPs. So even if that player aquired the 3 million gold via GDKPs over time a good portion of that is “likely” originating from 3rd party gold buying sites.
If you doubt me on the blizzard linking it directly with RMT read the post yourself