Is farming trading cards worth it?

Considering that electricity costs way more than the cards are worth...no.

Hard to say if it's really worth it. I've sold about 17€ worth of cards in the last year, but it took a lot of time and effort that I could have spent more wisely. Although ever since I discovered how many free games are given away all the time it's become a bit of an obsession and I quite enjoy figuring out how to sell cards for the most profit.
Leveling up a bit is good too though, since your drop chance for booster packs increases every 10 levels. I crafted a couple dozen badges during the summer sale without spending any money on cards myself, all I did was trade my unwanted/worthless cards for the ones I actually needed.

(btw I have one or two keys for games with cards that were given away for free, send me a message on steam if you want them :))

you can set categories for the games in your library, so just make a categories named ''Z trash'' and all trash games are in a little headline at the very bottom of your library

Yep, it's worth it. After a while you can get a lot of them and you can sell them for money, trade them for games or TF2 keys or whatever you want. I don't know why is +1 to your game count bothering you, but you can hide the games from your library if you want. You can also remove them entirely but imo that's stupid, since you won't get booster packs from the game either.

If you don't pay for your electric bill...

if you have a phone yes, if not, it doesn't worth it anymore

I honestly don't get why people care about having crapy games in their libraries, it's not like I'm forced to play all that stuff and just having it doesn't cause me any harm. I just have categories to organize my games.
About farming, I'm only farming my alt account right now and mostly for leveling up my main.

is there any way of farming cards without adding time count to the game in question in your library? I mean, I know about the min 2 hours played, sure, but, I would prefer to just properly keep count of what games I actually tried and played, rather than just have like 4-6 hours in each game without even knowing what is all about and how much time I invested in it.

I rely on them to get Steam money because Steam wallet cards aren't sold in my country :(

Not if you go ahead and buy extra crappy games to farm them. But I'm doing quite well with the cards from the games I got (which are not few I must admit, but 99% of my library is well curated). I'd say go for it. Those Cents do stack up in the end and I'm finding putting cards on the market a chill thing to do every now and then.

Its worth it if you know how to do it right.

I don't understand people like the OP.Trashing your library?Are you guys seriously this OCD that one crappy game in your library ticks you off?

OFC farming cards is worth it.You get free money and free tradables.It's almost always worth it to buy a game for a few cents just to farm the cards from it.And with all the bundles going on,you can literally use the cards to trade steam keys for bundle games that you want.Or you can sell the cards for steam wallet cash.Contrary to popular belief,cheap games are not always shit games.Or you can pimp your profile by creating badges from the free cards that you get.

Either way I don't understand why this is even a discussion.

Just some games I got for cards : Hitman:Absolution for 25 cards/Kingdom Rush for 15 cards/Lucius 1 a bunch of cards.And so on.I played and enjoyed all games.

Rather than removing the games from your library, you can simply set a tag and assign games you don't like to it.
I currently have a mess of tags like "Card Harvest", "To Play", "To Finish", "Cool Revisits" and "Garbage" \:3/

Pretty handy really, and having bad games in your account isn't some kind of horrible blemish. You can have them removed if it really bugs you though. Also consider that completing a badge out of those cards actually makes you eligible for random booster pack drops which is essentially more 'free money'. It never amounts to anything huge, but I had a spare £4 due to card harvesting at the start of the recent sale.

I don't go around collecting all the games JUST to farm cards.. generally if I get a bundle and I don't care for the game it ends up here. That said, when I do end up with meh games I farm em, sell em, and put the games in their own category.. (I don't remove them cause you never know..).

If it wasn't for the fact that I also craft badges, I'd probably of made some decent money by now, I mean not huge amounts, but enough for some good games. This summer sale I dumped a some cards and other items, and got ~$10 out of it.. Thats enough for a decent game on sale.