Q:
+ % Gold from Monsters
The gilded infusion is the most useful utility infusion, IMO. The amounts of gold you loot from typical mobs is low, but any increase spread over hours of game play will add up. Also, increasing gold looted is harder to do than buffing karma and experience gain.
Karma stacks up incredibly fast at higher levels, and there isn’t much to use it for in large quantities (Legendaries are one).
Experience also stacks up quickly, and unless you’re a Mystic Forge addict, you’ll have more skill points than you can use, especially with champs dropping skill point scrolls as often as they do.
As you noted, MF infusions are probably being removed, so they’re no longer really a consideration.
Just my thoughts on it. I’m sure there are differing opinions.