Keys and steam money

Buy with Paypal from a trusted trader on steamtrades.com

buy games, trade for the keys?
or maybe somebody will agree to "trade" the keys for a token item, then you "buy" that item from the trader on the market at an specific price...

Just buy them off the market. Other methods are too much effort, like buying games with the steam wallet and trading for games.

Buy CSGO keys, sell them on the market for more price, you can make like 5€ CENT benefit from each, but there is lots of ppl doing this already. Sell 20 keys for like 2.12 each that you bought for 1.80, and you make 1€ benefit.

What are you asking here? I don't get it... Buy in game keys. And why do you want to buy them and then sell them?

Put in the purchase order at 1.6. Then be patient.

if you buy me the humble 2k bundle for 1 euro , i wil give you 2 keys for what game you want

There's really only three ways of doing what you're asking, and they're already mentioned. They all have positives and negatives, though.

Buy keys on the market.
Purchase stuff on other people's behalf, and have them pay you in keys (could be a pain doing that many trades unless you're patient or can find one good trade).
Purchase an item for $35 from a trustworthy person, in exchange for an agreedupon amount of keys. (Valve would take their cut, so that would eat into the cost).

Best way to do it without taking a market hit would be to buy games that go on sale then trade them for keys.