Quick questions about cards

Maybe try bullet points to make it easier to address, but there's quite a few discussion on those questions you can find with the search box.

1. If you don't care about level benefits, sell them
2. Mostly, I keep some emotes and backgrounds I like. You can also spend the $ on other items and trade those for games, like CS:GO keys. Also some people trade games for cards.
3. Yes, Steam Inventory Helper, but not for the quick selling button. If you want to take your time and look at the trends, then you can put it lower than the lowest price or insta-sell if you don't see it selling at base price, but consider your time more valuable than 1 cent.
4. Use ASF

• I crafted cards to get to a higher level to unlock showcases and for the increased booster pack drop rate as an extra bonus. When I unlocked the showcases I wanted, at around level 100-ish, it doesn't become worth it anymore unless you really like having a high number on your level.
• I keep a bunch of cheap cards to trade for bundle/free games in case I need some fast trading currency, and sold most of the spare cards that have decent value (after the usual 0.02 fee is deducted). I kept those cards that can be used on TremorGames and those I had already collected in a set but simply didn't craft, in case I want to craft them someday or help a friend gain some levels early on.
• I use Steam Inventory Helper to sell cards in bulk, but I manually check the price of every single card to ensure that the automated process doesn't rob me of a few cents because of poor estimates. You can change the configuration so that quick sell matches lowest price on market and not 0.01 less, by the way. However, this could still screw up if the majority is selling at 0.01 higher and there happens to be one person currently lowballing the market with one card. Hence the manual check.
• Always used IdleMaster and it's still working well. Necessary when you have tons of games, and despite all the praise for ASF, I've tried getting into it twice and found it incredibly complicated to set up, plus it doesn't allow for simply idling while you do other things on the same account, without having to set up external accounts.

1: Crafting badges is for ppl who care about steam level ... i dont :)

2: anything thats worth more than 7 cents yeah pretty much gets either sold or traded for games .

3: i use enchanced steam and yeah depending on cards i do tend to use the quick sell option saving myself some time making the listing ... but not often :)

4: yeah i actually still use idlemaster , and the thing is working perfectly fine ...i tried asf , i still have it ... i just dont really like it ... duno why .
Idlemaster is working perfectly fine still so i dont see a point to moving away from it ...yet

1. I did that up to about level 50, then when they started requiring the Steam mobile authenticator, I stopped.
2. I used to sell some cards, and buy/craft others, but when they started requiring the Steam mobile authenticator, I stopped.
3. No, even when I was buying and selling cards.
4. Have never used IdleMaster or ArchiSteamFarm, and don't plan to.

If you do, do you use that chrome extension that allows you to sell more things at once ?

This is a violation of Steam TOS so you may risk getting banned for using such tool.

You may not use Cheats, automation software (bots), mods, hacks, or any other unauthorized third-party software, to modify or automate any Subscription Marketplace process.

An example of a Subscription Marketplace is the Steam Community Market.

1. Yes. I craft the level 5 badge of all games I finished. Foil as well, if the price is reasonable.
2. I sell or crush most emotes and backgrounds.
3. Yes. It'd take forever without it.
4. No, I use ASF.