large groups VS small groups

A grpup of 1 player can farm serveral spots alone, get a ton of gold and experience points but is limited to very few regions.

A group of 2 players can farm ANY spot, gets only half as much gold and experience but can be 1 to 4 times as fast as a single player (a Me/E can speed up things a LOT) , thus getting more gold and experience per player per time. It only needs some basic coordination and 2 highly depend on each other.
It can not reach any destination because it can not be flexible enough.

A group of 4 players can farm any spot and reach any destination. Generally such a team knows each other so everyone knows what everyone does in what situation. If one still has to go everyone is screwed.

A Group of 8 players can farm any spot and reach any destination. Generally it fails because one of them tends to screw it up or most do not know each other, some dont even care for anyone. Up to 4 players can leave without big trouble, it just slows down its progress to a 4 player group.

A group of 8 can do anything 1 to 4 times as fast as a group of 4 and therefore it can give each individual 1/2 to 2 times as much in the same time.

I have had good groups of 8 farming all of sorrows within ~2 hours and groups of 4 that needed ~6 hours, same drops, just half as much for each person.

All groups i met think they get more drops in small groups, thats why they are small.
What am i missing here???
Are all of them just ignoring the passing time?
- Some make it with less people in the same time, most dont do it with twice as much people in less than half as much time. but its easy in theory.
Are to many large groups just wasting too much time?
- Most do, and they seem to like it that way.
Loving privacy?
- They for sure are not in small groups to stay private, seen to many small pugs fail.
Are they afraid of one screwing up all, or bad attitude, intollerance or do so many just fail in larger teamplay?
- Some do, but you can simply ignore them.

Do ALL small group farming players fail in simple physics that divides efficiency by time, or is it the exponential efficiency that teamwork gives or am i missing something?

"i prefer larger groups, i just like the challenge of coordination and speed-running, i'm not sardistic"
"A large group can do anything but goes worse during time. A small group fails quickly or goes on for a long time."
"2 Paladins are allready 3 Paladins too much."
"the drops are better with less players? thats bullshit, its just more drops in way more time"

in my experience drops rates are related to the amount each particular account has played guild wars.
A friend of mine has 2 accounts his newer account is soley for farming (passing over items to his old account for identification). He was recently gushing over teamspeak about the amount of gold drops he was getting soloing the "orrian excavation" quest, I joined him for the very next run and between us we got 1 purple. He went out solo again after that and resumed raking in gold items.
It seemed my being in the party on my very active account sabbotaged the drop rates.
Go figure.

Drops usually are better with more people, I noticed