Multiboxers don’t account for anything even close to a substantial portion of the playerbase.
If there’s less gold in the economy then the prices of things will have to drop. Remember how hilarious Warlords of Print Gold was? They pulled back in Legion and low and behold the average prices of things fell, including the WoW token.
This has changed. I noticed today on PTR that Legacy Loot was enabled, so I checked out Highmaul.
I do indeed get 5 items per boss from Highmaul on PTR, but the vendor values are 37% - a bit more than 1/3 - of the values on Live. It seems entirely possible to me that Blizzard will not change the values from what we see on PTR when Shadowlands drops, so anyone farming for gold this way better get it while they can!
Oh, they always do, to some extent. I was always convinced they would re-enable Legacy Loot though - they REALLY do not want to aggro the Transmoggers!
No doubt as soon as pre-patch hits, we’ll see people starting to get us fuller numbers.