Why do a large majority of people..

because a large majority of people are jerks?

Never encountered some person like that O.o

I Always saying thaks like 3 times and having a little chat with the gifter.
An the same for the guys Im gifting games ;)

Iv not had this issue..Most the time I am showered in thanks..Too be honest, I would rather have someone say log off then spam me with thanks and me ignore them and me look bad.

I don't know why you always have to say thanks.. Sometimes people are just not bothered to say thanks so they log off straight away I don't get what's the problem with that maybe they're not in the mood getting added by 20 people to trade same thing

I even played with people taking my games and giving me games. Haven't got any jerk cases yet.

Maybe they're not logging off, but immediately removing you from their friends list giving them the appearance that they had logged off?

I always say thanks and maybe chat for a little bit. Everyone I've given gifts to has done the same so far. I'm not surprised there are people that disappear right away though.

Never had this happen, thankfully. The closest to completion I got was a person that told me to add him and never accepted my friend request. >_>' The rest just sat on my friend list quietly for eternity.

I always say thanks and chat a little with them

It was a business arrangement not a favor. I don't thank my boss for paying me.
I do tend to stick around and chat awhile about the games being traded and tell the person to have a good day. I never thank them. What am I thanking you for, not wasting my time?

never had such a trade/giveaway. always enjoyed a little chat.