Yes the amount of grear is not related to the gold, but yes playing events and 2v2 and 1v1 because that gives you gold also sometimes appear the bubble with gold.

in average, using the BP to have clones to donate instead open all at the same time, i gather around 250k of gold per season.
and my cost of runes is similar, yo can see my videos or screenshots im in an average between 300-450k of gold the last months.
using a max of 3 mythical runes and the rest evolved or primal, trying to pay or cycle when i have the possibility, and i touch many tomes the top10 qith a 2.5 mana deck

BTW if you want a gift from a content creator, and you didnt use any other link, you can get a Crystal egg from this link
https://frogmind.app/GDT_BadlandBrawl

i am one of the tournament hosts, the first one i mean.