"The only way to sell a game is back to Valve and not to another user as to avoid any issues"
Why would valve want to buy back a digital copy of a game they just sold you. Digital copies can be copied an infinite amount of times for no cost. There would be no reason for them to buy it back... let alone resell a still brand new copy of a game for a reduced price.
I think some people don't understand that a digital copy of anything is always new. Their resale value is always going to be 100% of the original price.
I for one wish I could be there when steam's lawyers make a complete joke of the people challenging them
What these guys are essentially asking for is the option for everyone to be entitled to a full refund of their money, whenever they want, of a perfectly working game, when they get bored of it.