Maby this method is known not realy exploit just nice use of game mechanic, this is how it goes.
Character lvl 61 creates game on torment 6 (adventuremode ) invites rest then he switches to his 70
u do only bounties that are clear kazra den or any den dungeon in some act , monsters are lvl 61 dont do much dmg if u are normaly geard for 70 lvl
u get 300k gold and 56+mil exp per bounty ( only clear some dungeon , kazra, den of evil baracks etc.
it is realy fast 10 min work maby less if party is organized.
sory if any gramer mistakes first post here and thanks to all who post in normal exploits no diablo 3 elite acces