This idea has been through the mill a half dozen times.
The idea is simple. 50% of XP earned and 25% of gold earned by an Alt is give to your main. Its not however taken from the alt, as in a mystical 50% just appears in your main, and so on and so forth.
After long, boring, deliberation I have come to believe that this would be the best and simplest way to make alt's more of a joy to play. Other than their intrinsic fun value.
There is a second poll added to this one, a sub-poll.
Should an alt XP+Gold Bonus be added retroactively.
Cheers