How much gold can YOU farm per hour?
UNBOOSTED (stock) - how much gold can YOU farm per hour?
Boosted (10 gem per barracks/spell factory etc) - how much gold can you farm per hour, if that's how you play?
FULL GEM* (gem finish your army, for those who do this) - how much gold can you farm per hour?
I'd expect them to go pretty much in that order, and most of us can't answer adequately for all 3.
I've seen enough comments about "I make 20 million gold per day, and only boost the barracks" and I am not buying it. Maybe you can CoC while you eat, and maybe you can CoC while on the toilet, but not while you sleep. So many people talk a big game on the forums. How about people IN GENERAL share their averages? No need to exaggerate.
As someone who isn't interested in paying hundreds of dollars on this game, I don't gem apart from the occasional boost. I'm still sitting on over 1400 gems from common achievements, and that's the only way I get them these days... just a choice I made. I can't play more than 4 hours per day, and I don't think I've ever broken 2mil per hour in any repeatable way... that's with both luck and with heavy skipping. But apart from walls, I'm a maxed TH9, level 106 (yes, I know there are a bajillion TH10s in the 150 range here... just pointing out that I'm more of a forum lurker, but not new to the game.) I would say that 1mil per hour UNBOOSTED is reasonable, but certainly no guarantee, lately. Much more is possible (even unboosted) but it requires luck in terms of what's available to farm, in addition to skill playing.
*note - NO ONE CARES if you gem. It's not an insult. The only "bad gemmers" are the ones who set up an account, dump money into it and make immediate uber premmie TH10s and never learn to play. The top players in this game will almost ALWAYS have to gem, to keep going. We understand this. Don't get defensive.