Not gonna happen.

Nope. Limited by Gaben.

Nope.

Check this out
https://psteamcommunity.yuanyoumao.com/tradingcards/faq/

Yep.

https://psteamcommunity.yuanyoumao.com/tradingcards/faq/

引用自 SheLeG The Kid：

is any Chance to get the other half of card drops?

Nope, same rules.

And yes, ASF is much better.

https://psteamcommunity.yuanyoumao.com/tradingcards/faq/

Is there a limit to how many trading cards can drop?
Most games will drop a number of cards equal to about half the number of cards in that game's set of cards. For example, Half-Life 2 has 8 cards in its set, you can receive 4 card drops by playing it. You'll need to collect the other half of the set from other community members. Try the beta group discussions, community market, barter with friends, and trade discussions. You can check how many drops you have remaining on your badges page.

You can't idle cards from game forever.