Cost of items - both inside and outside GKDPs - has gone down slightly in last few weeks since I made that post. So it is a great time to make an alt as you can get a lot of tier gear for minimum bid - but the rare items still go for a decent chunk (though generally a bit cheaper than things were last few months).
You can keep saying that GDKPs aren’t a real raid system, and it is fine to hold whatever opinion you want. But in the game there are thousands of people who raid using that loot system and do not buy gold. They are not getting carried, either. They choose to raid with GDKPs because it is the loot system that gives best gear distribution, incentivizes people to continue raiding full bis toons, and are overall a fun time.