If someone buys gold on Era to win items in GDKP, it prevents players who do not buy gold from earning gear.
If someone buys gold in SoD to get their 12th alt some garbage blues from the auction house, it doesn’t matter. You are not locked out of raiding because of it.
This is not a controversial thing. It is exclusively a classic era problem (and a relatively recent problem - GDKP did not exist on era for years)