I agree it's robbery... (one of the reasons I don't play for credits).. but I think your math may be a bit off.
If I were to wager 100 credits against your 100 credits, we would have a 200 credit pile. The winner of that wager will win 180 credits. That's 20 credits difference.
20 credits = 10% of 200 credits.
But that's not the point of this thread.. the point was can we gift credits.. and the answer is still "No". There are ways, as listed above, to move credits from account to account at a price, but you can not simply gift pure credits.
Peace.