I haven't had a chance to see if that's possible...

If possible, how many games, and what genres?

It was looking much better before the payment processing drama...

I would like to make a living from itchio...

All I wanted was just some comments, views, and downloads—and even that has been difficult.

I’d like to earn a living from itch.io.

No, I never could make a living of itch, but to be honest, I never even tried.
I want to create games I can stand by and any money they could generate is nice as encouragement, and it's actually never been enough to make a living by or to even invest. And I actually never had the illusion, either.

Man, my game is free, and to this day, nobody has played it lol.

From the point of view of a customer rather than a developer, I am not surprised by the sentiments in the responses thus far. I have two main concerns that reduce my inclination to spending money on Itch.io: Finding games I want to buy is too tedious; and many developers either seldom put their games on sale or don't match their sales with other platforms adequately -- let's be honest, most people only buy games when they are (sufficiently) discounted. 

Even if I weren't a skinflint, I have to often be consciously willing spend more money for less (if I choose a different, cheaper game elsewhere instead) or the same product, just to throw the developers or platform a bone.  

More than that, you guys have to compete for my time and attention with every other platform. I hate to be the bearer of bad news, but I'm just not trawling through the 1.5 million other games just to dig out and play the (possibly amateur) game you worked really hard on. The likely outcome is that I take the path of least resistance and increased consistency/security in spending and avoid the associated risk with purchasing an independent developer's passion project. In other words, I'm far more likely to buy the new hot game or the cheap 20 year old masterpiece than the uncertainty of yours. Don't get me wrong, I found some great games on Itch.io, but I had to put so much time into finding them.

And you have to out-do that. It's pretty rough; I don't envy your position. Unfortunately, if you want to be able to make a living on Itch.io in its current state, you already need to be able to make a living elsewhere: to grab my attention from that place and draw me back here. And the excessive effort in both time and money required in cultivating that... I doubt it's worth your while.

I think it's likely only possible if you've got a lot of games you've made, to make a living off just games on itch, you'd likely need between 1,000 and 10,000 games on itch to make a steady living, the odds that people buy a game is already low from a single creator so you'll need a lot of games to not only increase the odds someone buys a game but also enough people to make a living weekly. 

Unless you get lucky and one of your games blows up and gets tons of reach online, it's better to also post on other places like reddit and upload to steam.