The confirmation came from the Steam support staff earlier this month when Resetera forum user delete12345 asked Steam support if he can put his Steam library in...
“yes, you made a purchase. But what you purchased were tickets. Tickets to specific rides at a theme park. You did not buy the rides. You bought tickets for the rides. Those tickets are valid for your personal use. If you are not the one using them, they are not to be used.”
–Their argument in court probably.
You can resell Windows CD keys legally in the EU as the courts rejected the “only for you” part of the argument: invalidating that part of the EULA. I probably have the right to resell my Steam game tickets.
“yes, you made a purchase. But what you purchased were tickets. Tickets to specific rides at a theme park. You did not buy the rides. You bought tickets for the rides. Those tickets are valid for your personal use. If you are not the one using them, they are not to be used.” –Their argument in court probably.
You can resell Windows CD keys legally in the EU as the courts rejected the “only for you” part of the argument: invalidating that part of the EULA. I probably have the right to resell my Steam game tickets.