As much as I hate G2A and their shaddy business, is there any proof of that? Because there's prison for carding, unless they're living in Russia or some shithole where FBI can't take them from.

The phrase "for all we know" is used to indicate that the speaker has no proof one way or the other. Up to 10%. And they don't say 10% of what. 10% of gross revenue, or 10% of G2A's take? Or of a nebulous "net"?

Considering the totals would have been 450k, then up to say 45k would have been still a kick in the gut. (and that's on the high end). It's bad no matter which one is used.

That's the thing about getting yourself affiliated with G2A. No matter how bad the deal seems, it's actually worse than that.

Yeah... quite glad I never have done anything with them. My purchases are primarily through GoG and HB, keeps this BS to a minimum for me.

What "sellers"? Are you familiar with the idea of copyright and how it applies to digital goods? The sale should be authorized by the copyright owner, anyhing else is copyright infringement and fucking illegal.

Here are some offers from Amazon:

FINAL FANTASY XIV: Heavensward [Online Game Code]
by Square Enix
Sold by Amazon Digital Services LLC.

LEGO Star Wars: The Force Awakens Deluxe - PS3 [Digital Code]
by Warner Bros.
Sold by Amazon Digital Services LLC.

Tom Clancy's The Division Underground - Xbox One Digital Code
by Ubisoft
Sold by Amazon Digital Services LLC.

Notice how all of those are sold by "Amazon Digital Services LLC" and not by bumfuck_cockmongler_666?

Otherwise, anyone can sell access to copies: "paypal me $10 and I'll link you to my Mega folder". There, a better deal than G2A.

It should if you're concerned about the proliferation of DRM and want alternatives. If that's not an issue for you then do as you see fit. But I would say that you're on pretty thin ice as far as ethicality is concerned.

THOSE ARE FAKE?!

On the contrary, I feel that being pro-DRM-free is all the more reason to be for the freedom of doing with the code you bought whatever you want. Otherwise the whole "on steam you're only renting" rhetoric loses its meaning. DRM-free proponents themselves often emphasize that the strong point of DRM-free is being able to own the game just like you would own a physical copy. So you should be able to sell it to someone else.

And how is that ethically thin ice? It might be legally thin ince, since technically you're violating the terms of service, but ethically it's same as selling a toaster on ebay that you bought but don't want (or a toaster that you got as part of a spend-100$-and-get-a-free-toaster promotion). Is that ethically thin ice too? To be clear: I'm talking about unredeemed codes, so there is no question of you downloading a DRM-free copy and then selling it to someone else.

G2A and its friends ( the other shitty marketplaces ) still don't give a fuck about tax laws . Avoid them .

Do you know what GOG's profit margin is? How about the game developers? Do you know what their overhead is?

You don't sound like someone that has much life experience under their belt.

I'm a game developer, been for 5 years now. I've been writing programs for a living since 2006. So yes I'd say I got plenty of experience under my belt. No, I wouldn't mind my software being resold.

Now, how about you actually give me even a single argument about why a digital game should be treated differently from a physical one, instead of personal attacks? Because otherwise "Hey, do you know what a car producer's profit margin is? or the dealer's. You don't sound like someone that has much life experience under their belt. Selling second hand cars should be forbidden!"
The only reason software is different from a car is that you can easily make multiple copies, but we are talking about unredeemed keys here, so this doesn't apply.

They are selling keys that they obtained, usually legally. The people are not selling the game, they are selling their unused license, which is perfectly legal. It's like selling a car I bought. There isn't a duplicated license here, there isn't a magically generated copy. It's a person selling their unused key. Unless the person is selling a key obtained fraudulently, which is not uncommon there.

I think it's pretty accurate to say it's similar to ebay for digital game codes. They simply need better protection against fraud.

If the contract that comes with said game says you can't transfer it - then yes, it's technically illegal. Not necessarily immoral though.